Well to put on my comic retailer hat a bit...I will say that DC fans tend to have more baggage with characters and characterization than Marvel fans do. The term "Marvel Zombie" (the fan not the comic) exists in part because Marvel fans are fiercely loyal and are willing to allow major leaps in characters (though lately replacement seems to have an affect) and outright changes. It was kind of crazy to watch and it is why Marvel will always dominate the market. It doesnt matter the price, it doesnt matter the page count, it doesnt matter the author and it doesnt matter how big the line is the main line stories will always sell at a ton. (for DC Batman is the only one that has such loyalty though from time to time other comics did as well but never as long as Marvel)
I see your points and I think it also goes that DC from the very beginning has have multiple iterations of the same characters.
The only thing close is Spider-Man and to a lesser extent the Hulk.
I think one of the reasons Marvel has succeeded was the fact that Marvel characters have been relegated to tv shows, straight to video releases up to the late 90s and aside from Superman and Batman, comic book movies were a joke. So even though characters like Captain America, Thor, Doctor Strange, Fury, etc. have appeared in live action before there weren't "revered" because there was no real previous incarnations to be compared to.
Then Marvel did something unprecedented with their Big 3 (Iron Man, Cap & Thor), at least every 2 years these characters returned to the big screen. I feel, including their natural charisma, this endeared the characters to the audience and invested in them.
DC the fans are loyal to specific versions of characters or replacements of those characters. Pre-Crisis, Post-Crisis, Nu52, Flashpoint...etc. Superman's origin used to light message boards on fire. (Silver vs. Gold...MOS vs. Birthright) For YEARS there was groups of Hal Jordan Green Lantern fans that would right letters/emails/blogs/message board posts to and about creators denouncing Kyle Raynor (called HEAT) and creating hell. The loyalty isnt necessarily to the character but to the interpretation.
The films seem to go along with this. People have seen multiple different versions of some of these characters on the screen. People are loyal to their version. The longer a character has been around and the more it gets re-imagined over the years the more it divides the audience. Sometimes people stay loyal through it all (which we will see if that happens when Marvel starts rebooting their films) but it seems with DCs characters people stay with the vision they like the best.
JMHO.
The problem with that is we represent such a small percentage of the movie going public. I don't think the general audience cares if it's Pre Crisis, Post Crisis, etc. as long as it's appealing to them. I get your analogy and if we were talking a smaller medium like a book, a direct to home video release, or even a limit series, go with an idea like Snyder but if you're looking to appeal to a broader demographic than you have to make something that isn't divisive.
Edit: And that Superman and Batman picture is already out of date because of Hoechlin and Pattinson.