I have to agree with the majority. He's simply NOT a contender at WW anymore.
Like someone else said, if he cannot cut to 155lbs, then he really needs to fire his weight trainer (or hire one?). He could easily be a good sized 155lber, but its not like he should have that much difficulty making it to that weight. His only excuse is laziness.
I think his chances of fighting effectively and getting another title shot are MUCH higher at 155lbs, where his size disadvantage would be lessened. The guys currently at 170lbs are just too big and too strong for him, as well as having much more reach. Sherk dropping to 155lbs was the best thing he did for his career, and I think Serra could have a near similar boost to his fighting career doing so.
I really dont know what the guy is doing, because hes letting the last few years of his fighting career go to waste by sitting idle, not fighting.
I wouldnt pay to see him fight at 170lbs anymore, he's not a legit contender there.