Watson's a pipe dream, but I think Stafford and Garoppolo are both very realistic. And I would love to get either of them. I'd prefer Stafford, but wouldn't mind Jimmy G. either at the right price.
You could still draft a QB to develop long term, but I also think Stafford/JimmyG would mean you have 3-5+ year plans in place, which might also fit with the timeline of Belichick's career unless if we're not expecting him to retire until after he's 80 years old lol.
There are a lot of holes to fill, but I trust with the cap space and draft picks + returning opt-outs, they can find a way to become a playoff team again as early as next season. The AFC's getting better, but after KC I'm not sure there are too many "sure bets" in the AFC either. Plus now with expanded playoffs, I think with a good QB the Pats can have a chance to make it as a wild card.
I mean, they went 7-9 last year with barely any talent and Cam Newton looking terrible from October onwards. Most other teams with a similar roster would go like 5-11 or worse. Now yes, some of that is Belichick's fault due to poor drafting, but even then I think with an average QB, they could have gone like 9-7 or even 10-6 last season. They did lose like 3 games in the last seconds which were very winnable (ex. Seahawks + Bills games).