Apparently Silva's management is considering move to WW. My guess is he's motivated to fight GSP.
As a fan I'm not too keen on WW, would rather see him move up to LHW or stay at MW.
I would only like to see Silva fight at WW if he fights GSP and if it's for the belt. If GSP is smart he will move up for a super-fight and fight at a catchweight with no belts on the line.
Have a feeling Silva wants the big name/money fights before he winds down his career.