First: Here are two questions about what might happen right after Final Crisis; each may be answered with a simple "Yes" or "No" -- although if you want to type out lengthier answers, feel free! 
Question 1. Do you think DC should do a reboot of most or all of the Post-Crisis continuity of its big-name superheroes? (Superman, Batman, Wonder Woman, the JLA in general, the Titans, etc.?)
Question 2. Do you think DC probably will do a reboot of most or all of the Post-Crisis continuity of its big-name superheroes? (Superman, Batman, Wonder Woman, the JLA in general, the Titans, etc.?)
Now that you've seen the questions, if you actually want to know why this is on my mind, I'll talk about them a little. (Or you can skip the rest of this post and just post your answers, if that's all you feel like doing!)
In the last few months, on various forums, I've seen fellow fans speculating about whether the upcoming Final Crisis will be "Really Final" in the sense that it will be the "Final Appearances" of the current versions of most or all of the mainstream heroes of the DCU -- Superman, Batman, Wonder Woman, and other big names, as well as their various friends and teammates and sidekicks and so forth, including all other past and present members of the JLA and the Titans . . . you get the idea.
One possible argument in favor of this idea rests upon the following fact: Grant Morrison reportedly said the following (in a panel discussion in San Diego a few months ago):
"It's like Lord of the Rings in the DC Universe, he said.
The meaning of that is not terribly clear, even when you follow that link I offered and look at the context, but I'll offer one possible interpretation.
One key point about "The Lord of the Rings" is that it's a great big epic, with lots of characters, and battles between Good and Evil, and all that fun stuff . . . and then it has a real ending. Saruman dies . . . and doesn't come back. Sauron dies . . . and doesn't come back. Gollum dies . . . and doesn't come back. Gandalf and Frodo and various others "sail off into the West" . . . and don't come back. Things have permanently changed for all and sundry between the first and last pages of the narrative, even for those who are still alive and well when last seen. Tolkien never wrote -- never even considered, as far as I know -- any sequel trilogies in which the main characters, years later, would have to reorganize the Fellowship and sally forth on a quest to defeat Sauron (or his long-lost son, or whatever) all over again!
The way I look at it, the only way an epic set in the modern DCU could ever rival "The Lord of the Rings" in that sense of grand resolution would be if it was, in fact, the final appearance for the key characters in their current continuities, including any heroes (or villains) who got themselves killed dramatically in the course of events.
Otherwise "Final Crisis" will end up looking like just another dose of the same old, same old. Imagine this dialogue!
"Gosh, Batman, we managed to Save the Universe from Dire Peril, but in the process, Superman died again . . . and Lex Luthor died again . . . and Wonder Woman died again . . . and Darkseid died again . . . it sure is tragic and sensational, isn't it?"
"Yes, Robin, it is. For the time being. Now we just have to start up a betting pool on how many months will pass before Superman comes back from the dead, again, and Lex Luthor does the same thing, again, and Wonder Woman is resurrected, again, and Darkseid somehow reconstitutes himself and becomes ruler of Apokolips, again . . . "
P.S. Way back in March 2006, I solicited help from my fellow fans in drawing up a list of the times, beginning in the aftermath of "Crisis on Infinite Earths," when DC has basically Rebooted the continuity of a particular hero or entire team -- without bothering to Reboot their entire universe at any given time. I posted my results at DC's Reboots in the 20 years since COIE if you want to go examine them. In it, I also offer more details on how I define a "Reboot" and what does or doesn't qualify for that label.

Question 1. Do you think DC should do a reboot of most or all of the Post-Crisis continuity of its big-name superheroes? (Superman, Batman, Wonder Woman, the JLA in general, the Titans, etc.?)
Question 2. Do you think DC probably will do a reboot of most or all of the Post-Crisis continuity of its big-name superheroes? (Superman, Batman, Wonder Woman, the JLA in general, the Titans, etc.?)
Now that you've seen the questions, if you actually want to know why this is on my mind, I'll talk about them a little. (Or you can skip the rest of this post and just post your answers, if that's all you feel like doing!)
In the last few months, on various forums, I've seen fellow fans speculating about whether the upcoming Final Crisis will be "Really Final" in the sense that it will be the "Final Appearances" of the current versions of most or all of the mainstream heroes of the DCU -- Superman, Batman, Wonder Woman, and other big names, as well as their various friends and teammates and sidekicks and so forth, including all other past and present members of the JLA and the Titans . . . you get the idea.
One possible argument in favor of this idea rests upon the following fact: Grant Morrison reportedly said the following (in a panel discussion in San Diego a few months ago):
"It's like Lord of the Rings in the DC Universe, he said.
The meaning of that is not terribly clear, even when you follow that link I offered and look at the context, but I'll offer one possible interpretation.
One key point about "The Lord of the Rings" is that it's a great big epic, with lots of characters, and battles between Good and Evil, and all that fun stuff . . . and then it has a real ending. Saruman dies . . . and doesn't come back. Sauron dies . . . and doesn't come back. Gollum dies . . . and doesn't come back. Gandalf and Frodo and various others "sail off into the West" . . . and don't come back. Things have permanently changed for all and sundry between the first and last pages of the narrative, even for those who are still alive and well when last seen. Tolkien never wrote -- never even considered, as far as I know -- any sequel trilogies in which the main characters, years later, would have to reorganize the Fellowship and sally forth on a quest to defeat Sauron (or his long-lost son, or whatever) all over again!
The way I look at it, the only way an epic set in the modern DCU could ever rival "The Lord of the Rings" in that sense of grand resolution would be if it was, in fact, the final appearance for the key characters in their current continuities, including any heroes (or villains) who got themselves killed dramatically in the course of events.
Otherwise "Final Crisis" will end up looking like just another dose of the same old, same old. Imagine this dialogue!
"Gosh, Batman, we managed to Save the Universe from Dire Peril, but in the process, Superman died again . . . and Lex Luthor died again . . . and Wonder Woman died again . . . and Darkseid died again . . . it sure is tragic and sensational, isn't it?"
"Yes, Robin, it is. For the time being. Now we just have to start up a betting pool on how many months will pass before Superman comes back from the dead, again, and Lex Luthor does the same thing, again, and Wonder Woman is resurrected, again, and Darkseid somehow reconstitutes himself and becomes ruler of Apokolips, again . . . "
P.S. Way back in March 2006, I solicited help from my fellow fans in drawing up a list of the times, beginning in the aftermath of "Crisis on Infinite Earths," when DC has basically Rebooted the continuity of a particular hero or entire team -- without bothering to Reboot their entire universe at any given time. I posted my results at DC's Reboots in the 20 years since COIE if you want to go examine them. In it, I also offer more details on how I define a "Reboot" and what does or doesn't qualify for that label.