Unifying Belts

Why do most of you think that it is possible for the UFC and Pride belt's could be held by one person?

I honestly don't ever think it will happen,but that's just me.

I also really don't see Vitor holding the UFC Lightheavy and beating Vanderlei for his Pride middleweight,or the other way around.

Even if they were to fight each other while they are the current champions,I still don't see a title shot type match working,basically because of those crazy little contract thingy's.