What Could Possibly be Next?

So I’m a sonic fan but I’m not really a hardcore fan yet as I haven’t played either adventure games. But I know there isn’t a whole lot of story for the films to go off of. For example, the first film surrounds sonic doing his own thing, that being the first game, then there’s sonic 2 which is a combination of both the sonic 2 and sonic 3 and now that we have sonic 3 which is outright the story of Sonic Adventure 2 I’m not really sure what else they can work off of. Personally I feel like they should leave it here as a trilogy and not continue but considering the post credit scene that probably won’t happen. I guess sonic 4 could maybe be based off Sonic CD or include Silver’s story but I’m not sure other than that if there’s enough story to work off of. I’m interested to see what other people think could be the future of the films.