These re-matches are nice but lets look at title defenses.
Ok, so at HW we have Silvia. Who does the UFC have that they can bring in to make a competitive fight for him?
At 205 you have Chack. Seriously, who can the UFC feed him now? Even outside the UFC Chack stacks up well.
At 185. There is Franklin. Anderson Silva seems like the best match up there. A good fight for sure.
At 170. It's all over the place. Hughes and BJ is a smart move. After that you have the winner face GSP. Somewhere in there you have to put Diego too. He's just earned it.
155 is going to be Florian/Sherk. After that you have Jens Pulver, and Spencer Fisher looking to take that title.
It seems the higher up in weight you go, the less competitive it gets.