You might be right.
I see little evidence that Bush cares a whole lot about a Conservative being elected President in '08, and moving Cheney out and setting up a Conservative Republican for the nomination in '08 could very well be the only chance a Conservative has at this point.
That's absurd. As someone pointed out earlier, only TWO vice presidents have ever been elected president. And one of those was GHWB, whom I suspect you didn't much care for. There is absolutely no reason whatsoever that the Republican nominee for 2008 needs to be running as a vice president. Look how that worked out for Al Gore.