Not for much longer. We already know Damian's leaving the Titans, go look at the April solicits. And if 5G's meant to make Jon the new Superman, he won't be staying with the Legion for very long either.
Though that's not the topic of this thread. This is about what you'd do if you're in charge. And I don't think those characters should be limited to team books.
That Earth-1 thing sounds like the Ultimate Universe. That's what New 52 should've been. An alternate continuity, not a reboot.