So long as it isn't 'Teen versions of the classic characters' like that Gotham High cartoon that got pitched (or was that fake? I really can't remember) I'll likely give it a try if it ever materializes as Teen Heroes tend to be my favorites.
Oh, that was a real pitch.
lostmediawiki.com
And, if Justice U were to happen, I'd probably expect it to be a combination of Young Justice and Teen Titans Academy characters. Maybe some forgotten legacy characters from JSA in there, too, like the Crimson Avenger. Thing is...the CW already has Legacies, its own show about a school for kids with powers so I feel like it has the least chance of getting picked up. And I don't know how I feel about ANOTHER Batman show without Batman in it. This would make 4, right? Gotham (I know we got Bruce in this...but not technically Batman, much), Pennyworth, Batwoman, and now Gotham Knights. I'd rather give the shows we already have a proper send off.
As for the shows themselves...I'll admit, I'm ready for the Arrowverse to be over. It was a fun ride, but I feel like they lost a lot of steam after Crisis. They didn't really seem to have a plan for what to do going forward after that. I'll be a little sorry to see it all go...but I think I'm ready to let it go.
Personally, though, if they are going to end all these shows, or if the rumors about selling the CW turn out to be true...I'd like them to do one last big crossover event between all the shows one last time. At least then we can say they TRIED to go out with a bang.
And you know what event I think would work best as a swan song? DC One Million. That way, the shows might not NEED to actually have the actors physically interact with each other across the different shows (who knows what the situation will be in 6 months), but they could still connect together by doing some world-building in this new future world. They could even change things so we see what Episode One Million would look like for each of these shows. It could be fun.