I am not sure what is going on with Russell Wilson, but I don't think it is a simple as "he is done". Last season, he was 66.4%, 26 TD, 8 Int, 98 Rating. He had the 9th best rating in the league, 6th best among QBs with more than 10 games. He is 35. That is a pretty good season for a QB who is "done". There was clearly some disfunction between him and the coach.
A deal would have to work for both parties. The Pats are not going to want to offer multiple years, they just want a vet for 1 year really. They could draft a QB at #3 (and sit him a year) or not. Wilson would have to look at it as a year to restore his value or something. He is probably going to want to go to a team that at least has a chance to win (not the Pats) but think what it would do for his legacy if he came in an led the Pats to the playoffs or even something just short of the playoffs? I don't think that is unrealistic.
Hard to say what the Pats' record would have been if we had Wilson. There are several more games we win if we had even an average NFL QB. We are going to have to shore up the OL in any case but Wilson behind a decent OL, with a really good defense? Maybe a couple of second tier WRs through FA? To me, that is a respectable team while still allowing rebuilding through the draft. Take a QB at #3, then OL, Receivers, etc. through the rest of the draft. Don't go crazy in FA but bring in good solid players at positions of need who can contribute for several years.
Not saying this is the only path, but I would be fine with this path. And if the QB you get at #3 turns out to be good, you are on your way.