Originally Posted by
Zeeguy91
The problem with that argument is that the most iconic versions of Superman and Batman now have them starting with the JLA not with the JSA. However, the JSA characters are still iconic in their own right and have large fanbases. Shunting them off to a separate Earth would likely mean that we'd rarely, if ever, see them. What, would they just pop up for a yearly adventure with the JLA and then disappear again like in the Pre-Crisis days? Or would it be just like the New 52, where they're in one title that will eventually be cancelled? Even then it wasn't officially them, but younger, less popular versions.
If my years of following comics have taught me anything, its that no matter how popular an alt-universe take on a character is, people won't necessarily invest in something in the long-term if its not part of the "main universe continuity." That's why Marvel folded Miles into the main Marvel U.
Plus, it would create continuity nightmares for characters with a history on both the JSA and JLA.
But, more importantly, I just think at this point, characters like Jay Garrick and Alan Scott are just too ingrained into the history of the DCU at this point.