Well, it sounds like it's dead, but when talks were still ongoing, I was wondering if Sherman would eventually convert to safety when he loses a step or two and extend his career like Lott, Woodson, McCourty, etc. Given his size and smarts, he'd seem an ideal candidate. We might see him here down the road yet - particularly if he's a BB pinky.
As a major NFL personality and talent in his prime, it'd be as weird to see him in a Pats uni as it was to see Moss. If he bought in, I'd guess his jersey would be a Top Seller again with a whole new fan base ready to spend and his diehard fans embracing the opportunity to get different gear. Surprisingly, he wasn't among the Top 25 selling jerseys last year according to NFL Shop. Defensive players aren't nearly as popular as Von Miller was the best seller and he was at #11. Sherman, however, was a top 5 selling jersey for defenders.