The Pats letting Welker go would be asinine. Yes Brady is a great QB but Welker is the best slot receiver in the game and has a legit 3-4 top notch years left in him. Gronk's forearm is about as fragile as Chaddycakes' shoulder, Lloyd is very overrated and guys Edelman, Vereen and Goodhead are JAG's made to look serviceable b/c they play with Brady and Welker usually takes away the #1 or #2 CB and Safety leaving those clowns covered by the 4th or 5th DB.
Today's NFL is all about the QB and WR. Welker is the one guy U DO PAY.