As long as the big baddie isn't Trigon or Brother Blood...Maybe make it Slade to introduce his family etc for future movies/shows.
This is a weird problem for DC in that one of their top franchises requires years of set-up, and some purists still don't care for it (IE- Everyone who thinks Robin doesn't make sense in Batman's world.)
Sincerely,
Thomas Mets
If Robin is already Damian then we know, well hope, that Dick was a Robin and moved on to Nightwing. If we have a Nightwing, then having a Titans, even a Teen on, would hopefully have him in it.
I guess if they go the straight "Teen" Titans, and legit have them all be teens, then maybe there is no Tim or Jason or maybe one of them is dead or both...Maybe the will have the Teen Titans and a Titans team? That may placate everyone...