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Okay, one thing though, we know NOTHING about Madara except that his Sharingan is great and his chakra more sinister than Kyuubi's. Said by none other than Kyuubi himself.
We DON'T know how old he is, and most diffinately don't know if he was the first Uchiha or whatever. Right now, anything about that is pure theory.
I've been hearing alot of people taking that kinda stuff for fact, when it's not.

Now, I've been thinking about Tobi=Madara thing too lately, and before I go on I will say, I DO NOT support the Obito=Tobi theory. I think this is the real deal, and that Tobi IS Madara. Although, that doesn't keep me from thinking about other posibilities...

Okay, so I'm gonna side-track a bit into this little theory thing I've had in my head for awhile now. It's based purely on my ideas, so I'm not saying this is going to happen or whatever. When waiting for new Naruto chapters, my head tends to wonder about what the future of Naruto will be like, and that's where this comes from.

Anyway, on to what I was saying.
Okay, so we know Kyuubi said Sasuke reminded him of Madara. So, say, for one minute, Madara is some legendary Uchiha from long ago. What if, Sasuke inherited his blood? That would give him, basicly a copy of Madara's power.
Okay, now, we know nothing of Tobi's abilities, so I'm gonna say, what if he can copy ( without the abilities of Sharingan beforehand ) genes and traits ( or blood lines ) of others somehow?
Like, take a look at the scene when Sasuke sliced throught Tobi, and he got back up? What if Tobi was 'copying' Sasuke's blood traits somehow? Which gave him a copy of Madara's power as well?

Hehe, yeah, I know it's really out there, but I wanted to share. xD;
I like the Tobi=Madara idea. But if he turned out not to be Madara, this would be my second guess.
And as for the Tobi=Obito... I donno, as much as I liked Obito, I wouldn't want to see him come back.
Not only would that ruin the moment for me when Obito is crushed, but I'm also kinda biased about not wanting Naruto to totally copy off of DBZ. >>
In DBZ, none of the characters stayed dead. It was boring. There were no sad moments because you knew you'd just see the characters again later!

I do not want that for Obito. His death was heart-breaking and a memory for me. I want to keep it there. One person coming back from the dead is enough. If all the characters that died started coming back again, then I'd have to say Naruto wouldn't have a big of an impact on me anymore. In Naruto, I like the idea that Kishimoto is willing to sacrifice characters. Because in real battles, let's face it, the hero's usual die. With Naruto, the battles keep me on the edge of my seat wondering which character will be left standing. Because unlike DBZ, once a character's gone in Naruto, I know they WON'T be coming back.