actually, Barry and Wally have been able to time travel for decades now. Wally and Jay need the Cosmic Treadmill to do so safely, and even Barry can only jump short distances without the treadmill.
apples and oranges, man. Flash is not nearly as powerful as the surfer or sentry or, say, the anti-monitor.
Wanda Maximoff
Franklin Richards
Charles Xavier
Silver Surfer
Nova
Magneto (depending on who's writing him)
Sentry
Hulk
Doctor Strange
herro?
you mean this guy?
or how about this guy?
Or maybe you mean this guy?
Take your pick
hey, it worked, ok? Have they yet to explain how 'no more mutants' made things even possible?
No?
Didn't think so.
Look, they're comic books. The more egregious Deus Ex's we balk at, but c'mon now. You can't kill Superman because he's iconic, anymore than you can kill Captain America or Batman and actually keep them dead.
The closes hero they did that to was Flash, and only because he was the second to bear the name, and even Jay Garrick is still around with most of the JSA members.
Barry Allen was, I believe, the most high profile death of a comic book hero any book had ever done, and it was a risky move bringing him back considering how popular Wally West is. But Geoff Johns hasn't done anything wrong yet, so we'll see where it goes.
But having two Scarlet Speedsters and three Flash's at the same time is going to be a bit awkward, especially in the JLA.