Bosh in NOT a franchise player. Even he knows it, that's why he's jocking Wade and LeBron since May.
He's a very good/great player, but he'll never lead a team to a championship. Whether or not Rondo can is a different question.
But I wouldn't trade a young PG with championship experience who possesses all the tools to be excellent in every facet of the game (shooting experts say his form is fine, I think he will end up being a pretty decent shooter, just not off the dribble maybe) for a rail thin PF who never sniffed success.