Final Word on Obito:
I can't imagine any redeeming value to Kishimoto chosing Obito as the Vilain Tobi.
Is it the shock or surprise value.....Well it is neither shocking or surprising, many readers have already guessed it for the LAZIEST of reasons such as TOBI +O =OBITO...Lame, Lazy, but not particularly surprising, more like dissapointing.
IS it to further emphasize the cursed fate of the Uchiha.....Well, we've already had more than a lot of that lately.
Neither does the choice demonstrate any great literary skill on Kishi's part, rather it seems forced/contrived. Kishimoto is now going to have to re-invent a rather torturous timeline with questions like when exactly did Madara die, how could Tobi have possibly formed Akatsuki, what manner of training/torture transformed a 13 yr old boy into a marauder that seriously challenged MInato, Controlled the Kyuubi, knew about effects of pregnancy on a jinchuuriki, one who had longed for a loooong time for the chance to reclaim the kyuubi, one who participated in the extinction of the Uchiha clan.
He would also have to explaing the large personality and intelligence changes from kind Obito whos intelligence is lower than Naruto's (as per the databook, sorry Naruto) to Tobi the ruthless killer and Mastermind.
For me there are other reasons for my dissatisfaction with the Choice. Instead of revealing the face of an evil doer whom we have not had a chance to empathize and sympathisize with, we now are forced to do an emotional about face. Whereas before Obito was a Shining example of an Uchiha who went to his grave a true hero, a ray of sunshine shed on a tragic and fallen clan, he has now been dragged down into the murky mire with the rest of his clan. We have been deprived of the pleasure of knowing and cherishing the memory of one single solitary Good, kind hearted and Normal Uchiha.
True enough that this is merely a Manga, but I would argue that literature should attempt to reflect some goodness and some hope. If the Uchiha are a metaphor for a minority Clan/group, there should be at least ONE of them who we can all hold up in all honesty and earnestly as someone exemplary of good amongst themwhom everyone can safely emulate.
Obito, that shinny eyed young man who loved rin, and who wanted to protect everyone is gone there is no one left to stand for the Uchiha. I am certain that Sasuke will redeem himself by helping to stop Madara, however I would have preferred that the good memory of Obito would have been left un-tarnished.