Should MCU Ultron come back?

I'd really like it if he did. James Spader isn't too old and seems to be in good health, so there's no problem on that front. Obviously he suffered somewhat from having his movie sandwiched between two movies with Thanos, but Thanos is gone.

I think him returning would add to his edge as a villain. Coming to try again now that Stark is dead. I've always liked that he comes back. The fact that you can never really get rid of him, that he ALWAYS comes back, is part of his appeal to me in the comics, and I'd love if that would translate to the movies as well.