I'm 90% sure Obito won't turn over. But, then again, Madara is the REAL antagonist, and he's shown that he has a way to control the Bhiju himself (and I REALLY don't think he's bluffing). Madara manipulated Obito--he used him and turned him into the man he is today. People take misery, anger, hardships and so on to hide the truith and their real feelings and Madara exploited that. Almost two decades of that has unbeleivable side effects. Look how it turned an innocent, truely good soul into a man that's done all of this!
I've gone through alot of crap--since I was a kid. Insults, slaps to the face, jerks, monsters, humiliation, depression and so on. A few years ago, I started thinking some pretty nasty thoughts when I was EXTREEMELY angry or depressed--but thanks to the people and things that I cherish and love, I eventually tell myself "No, Andrew, you're not going to do that; you're not that person." Obito NEVER had that during this period of his life.