He definitely could. If he shows us he has what it takes to beat GSP, I'm not sure Anderson would even accept a fight with him though.
Sure the likely situation is GSP beats him standing for most of the rounds, Jake maybe getting a take-down and stealing a round or two and GSP taking home the decision. But if he ends up doing to GSP what he did to Henderson... then in my mind he'd beat Silva 9/10 times and I'm sure that fight would be there for him.
When has Anderson Silva not accepted a fight.. only time I can think of is when it was for LHW championship because of a conflict of interest with Machida.
GSP has talked about beating Anderson Silva for years now since 2008, holding two belts, blah blah. He's been offered the chance to fight since 2008 in a public press conference "GSP will fight Anderson Silva next." When can GSP fight Anderson Silva? "Whenever he wants."
Given by the last 3 years, i would imagine GSP has been asked if he's ready to move up to MW a few times to fight Anderson Silva by Dana White..
After Sonnen fight..
St-Pierre acknowledges the fact that it will act as a blot on his career if he never moves up to fight middleweight king Silva, and he revealed a move to 185lbs could happen in the not-too-distant future.
"I plan to do it at one point in my career." GSP told Ultimate Insider "I want to make sure I've done everything I had to do in my division before I go up, because once I go up, I might for a little bit hold two titles at the same time, but as soon I'm going to go up and take care of business when I'm up, I'm going to let go of my other title."
“I want to be like Michael Jordan and basketball, Muhammad Ali in boxing. The way Tiger Woods was to golf. I want to be the guy .”