I know I am a little late to the party here but I'll throw in my opinion. I agree with Aldo and his right to refuse anymore straight from 155 fights. If Pettis fought 1 or 2 fights at 145 and got quick routed to the title, fine, at least he fought at 145. But Aldo is being treated as the Intercontinental Champion in WWE(WWF). We can't give you the title you really want at the moment (155) so we will give you a shot at something (145). It really is kind of insulting.
As for "The Champ should never refuse a fight", Aldo hasn't ever refused a fight from within his division. As mentioned above, Pettis isn't a 145'er, and Aldo already did the UFC a solid by fighting Frankie without any 145 fights.
I'll end my little rant with this. If Dana White wants us to take the lighter weight classes more seriously, then maybe he should treat them as such. Granting fighters title shots in divisions they don't fight in proves how valuable you think the belt really is.