Yeah, thats were I got it from. It's a decent theory.
Well, heres something else to think about, which is a hell of alot more complicated. Maybe all these alternate Universes we are seeing now were destroyed during the original Crisis. Let me see if I can properly explain this. I mean, when dealing with an alternate universe, you not only have the present, but a whole past and future. So, for all we know, the universes that we've seen could have simply been destroyed during the first Crisis. What point in they're universe they were in when the Monitor destroyed it is anybodies guess. And everything we've seen happened before that universe was destroyed.
Not saying that thats the way things are, but it's something to think about.