Maybe it's already been done in this thread, but let's look at the realistic QB options:
Big ticket items: Wilson and Watson
Modest possibilities with potentially some acquisition cost: Jimmy G, Mariota
Should be able to acquire as free agents: Fitzpatrick, Prescott, Trubisky, Taylor, Brissett, Newton, Dalton
Draft possibilities: Jones, Trask, Mond, Newman, Franks, Ramsey, Ehlinger, Costello, Book, Mills
Wilson or Watson would be amazing additions, but at an absolutely enormous acquisition cost. Still, might be worth it. Trading for JG or Mariota would give the Pats a veteran with some upside, but not likely pro bowl play at the QB position. JG might slip into the third category as well, if he gets released. There's some veterans on that FA list, with Prescott being the wild card there. He might be locked up by Dallas, but if he's not, the bidding for him should be sky high as there wouldn't be any acquisition cost, and he could give you pro-bowl play for years to come. And in the draft the Pats won't likely be able to get any of the top guys, but there might be some guys there that have legit NFL futures.
Who am I missing in this list? Gotta be someone I'm forgetting. Obviously keeping Stidham on the roster is something they could do but I'm guessing he's not in the plans as QB1 next year.