Normally I'd say a team like the Pats would just sell the farm in order to get the player they want. I could see them tanking the rest of the way and getting a top5 pick. Hope that DAL, ATL, HOU, or NYG get the top pick and trade their entire 2020 draft for the #1 spot to get Trevor. That would cure all that ails the Pats. However, that isn't the patriot way since they rely on those young draft picks to develop and supplement their ways of not spending in FA.
So to me either Bill adapts his way and NE actually goes out and spends to fill some holes this offseason as well as does everything it can to get the #1 pick, or the rebuilding process is a drawn out one. The FA QB's in 21 aren't a stellar group, but I could see the pats rolling the dice on one or trying to land Zach Wilson at the 5th pick.
If Bill does decide to retire that organization is hosed. His preparation alone can get them 4 wins a year. There doesn't appear to be a lot of talent on that team so him walking away could be a few <4 win seasons.