Or what if this whole time it was really one of Naruto's shadow clones and Naruto was behind everything? Or what if the whole thing turned out to be a dream and Naruto is just some crazy homeless dude? Or what if this whole time Tobi was Gamabunta?
I'd be very disappointed and like mike said then we'd have to go through two chapters of explanation then more flashbacks and shit. Plus it would just be anti-climatic because, I'l be honest with you, I couldn't give two shits about Obito.