I think he is already, but it's masked by an OL that gets overmatched against some of the elite defenses in our conference and division. The interior as a whole took a step back this year, particularly Unger and McQuistan. Sweezy had anchoring issues too. With Unger and Sweezy taking massive steps backward as run blockers, you wonder if Seattle will abandon the idea of smaller/quicker blockers in favor of pure size the way the 49ers have.
Thing about Wilson, he is effected more by a collapsing interior pocket than most QBs because of his need for throwing lanes. Get bodies in his face and he will not throw. Brees is a similar case- there's a reason why the Saints have spent some pretty big resources over the years at guard.
As much as I like Sweezy I am reserved to the fact that his future might be as a fullback, h-back, blocking tight end or jumbo package guy. His anchor against the bull rush just isn't good enough for a QB like Wilson, and I don't see much reason why he would improve in that area. I would love to see him get more reps at fullback / h-back this next preseason. Sweezy on the move is pure seek and destroy.