you might as wel take the "Socal" part out because they have hella talent down there, but it won't have anything to do with the Bay movement keeping going if a Crooked I, Bishop Lamont, or Glasses Malone blows up. Plus this is a Bay Area board...
I would have to go with Big Rich being next after seeing his video. ALthough I think any of the City rappers got a chance since there are a lot of quality songs that are supposedly on MTV Jams (which I dont get). Look What I've Done for Them, U C It, So Hood, and Thats tha Bizness.