I can see why people like the idea and I totally respect it, but I really hope that' isn't what the show does and there a few reasons why.
First off, I think a big part of SU as a show is accepting yourself, even the things that are hard to like. It doesn't have to define you but you should embrace who you are. I want to see Steven learn to love himself fully for all that he is. Steven rejecting the fact that he is a part gem, the son of a diamond, or that he has been shaped by all of these experiences would feel like spitting in the face of that. Sure it would be great for him to explore other ways of being and grow other aspects of his identity, but he shouldn't have to put aside or reject any of himself to do that. That would spit in the face of the show.
Second, I really really don't want him to get better by cutting himself off from everyone in the show and moving away. That can be a good message for some stories but SUF is specifically showing us how people Steven depends on emotionally haven't been good at helping the one time he really needs it. I think it would be a much better direction for the show if it ended with them learning how to be supportive and there for him instead of sending the message that if people your life don't initially know how to help you with your problems, you should just leave them. Again, sometimes that's true and it can be a good message, but SU about people who love each other learning how to help and support each other. Would be nice if Steven could get that help instead of having to figure everything out for himself alone.
Lastly, I just like the idea of a show where growing up doesn't mean having to leave everyone from your childhood who loves you and forming a completely new identity as opposed to growing from the one you already have. I think we put to much pressure on young people entering adulthood to figure everything out by themselves and be independent from their families. It's okay to need people.