Well we already know about Superman and Batman during that time, from what I understand Wonder Woman has been hinted to still be an active member. Martian Manhunter I would also imagine is still an active member bc I think he’s been hinted too. I noticed that you said you don’t count the DCAU comics to be canon and I agree with you on that. However, I could actually see John & Shayera retiring after they rekindled their relationship just like in the comics. I mean, they give birth to their son Rex, so I would imagine that if you want to be around and care for your child instead of going on countless missions risking your life all the time, you’d have to retire or do some type of set back (even though Hawkgirl comes from a war-like world, but still). I feel like by the time John & Shayera get back together they would’ve already spent years of being heroes, GL’s a former marine and spent 10+ years as a Green Lantern before joining the league. And I would imagine that him and Hawkgirl are around the same age as Superman and Batman, so I could see them retiring probably around the same time Batman retired. Hopefully during Batman Beyond Flash is still around whether he’s retired or not.

As far as the expanded league goes, this is sort of a cop out but when the league appeared in Batman Beyond I don’t think the writers at the time were thinking about JLU yet. So it’s hard to say. I would imagine some have passed away, retired or are still active.

@Winslowcrews3 I think out of all of them Diana's the only one that we don't really know what happens to her.

From BB,we see Supes is still active,Barda becomes a member in the time between Destroyer of JLU to Rebirth of BB and Bruce is retired. Manhunter could still be active since he ages slowly. Future Shock from SS shows Diana is still active. My guess is WW,Supes,Manhunter and presumably Flash are still active. We know Shayera and John are retired and Warhawk is their son. As for the expanded league,they're either dead or retired