Stidham or someone at a similar or slihghtly higher price is key in order to give the Patriots a couple of years of cap space in FA market.
If Brady leaves and Stidham is performing well enough to keep the starters job for 1-2 years it would be great as he will be on rookie salary.
If he does not work out could consider 1-2 years of JAG veteran QB who will come relatively cheap e.g.:
Cody Kessler, Brett Hundley, Chase Daniel, AJ Mccaron, Bortles, Glennon, Matt Moore
It would be amazing if they could get a steal in the draft in rounds 2 or 3 for a QB like Jalen Hurt, who I think is very undervalued, tough as nails and athletic but could be very good with solid coaching around him
Unless the team gets unbelievably luck and Stidham outperforms what everyone thinks he can do, 1-3 years of mediocre QB play at best is likely going to happen. Need to bottom out to reach contender status again, most likely.