JLU made a future where batman beyond doesn't happen possible, in Once and Future Thing Old Bruce doesn't even remember him going to the future and meeting his other self and JLU bruce meets warhawk and tells Shayera about him, the timestream was messed up so only GL and Bats remember.

Batman Adventures season three comic introduces Waller and the prototype batman beyond suit?

I believe that Dwayne McDuffie left an opening so the DCAU batman beyond future doesn't happen by accident and that ROTJ doesn't happen. Granted Bruce Timm made JL VS Fatal Five which was decent but felt more like a spinoff JLU movie, it's script was also really emotional and not in JLU usually alpha male smackdown writing to quote supergirl and now with Kevin Conroy gone we'll never see another DCAU project or even BB film