The Bills are not a good example as they had a top-tier defense last season. All they needed was a QB who could push the ball up the field and make minimal mistakes, which was Orton and not Manuel. Same with Houston. Top-tier defense and a great running back, just need a QB who was not a liability.
Seattle already had a stout defense and good running game before Wilson came aboard. As they added and developed players on that defense, they got better. That team's success is mostly predicated on only allowing 15-17 ppg and excellent field position for the offense.
That said, while I feel Wilson is a Top 12-15 QB, I think that team would be fine without him. If Peyton went down in Denver, they'd be screwed. Same with Rodgers in Green Bay and Luck in Indy. Those teams rely heavily on their QBs.
BTW--I'm not going to get into it with you on Foles, but here's a nice pic of Wilson totally ignoring an open man to scramble right:
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Your boy certainly isn't perfect.