Hello,
did you also ever think that it would be nice and logical to see the young Superheroes (Dick and Tims Generation) rebell against the JL?
1. Because of Flashpoint...
It was Barry who kind of started it and so actually this could be a good reason to start such a rebellion, by heroes who lost things during the change:
-Arrow Family, especially Roy Harper who lost Lian
-Conner Kent, because he was basically kind of whiped out (at least at the moment) of the timeline
-Tim Drake because he lost his whole youth with the YJ and TT (with Conner,Bart,Cassie,...) and lost his memories etc.
-Wally West because he didnt exist in Rebirth and his time with the TT and JL were gone and he also kind of lost his kids and his marriage with Linda
2. Because of the dominance of the JL (especially after they abandoned the Titans)
3. Sanctuary, Heroes in Crisis, what happened to Nightwing, Alfred etc.
4. Simply because they are the new upcoming generation...