If Brady plays another 3-4 years (LOL... I love the guy, but I do not see this happening), and the contract timing is bad, and Rosen doesn't want to stay around the same time that Brady is leaving.... We have a very good situation. We have an ex-top 10 QB that's 25 years old and has been tutored by the GOAT QB for the past 3 years. I think we'd get more than a first rounder for that.
Any investment into Rosen will reap rewards, assuming we can get him for a 3rd and he won't throw a ***** fit for sitting on the bench (I don't see that happening, but I'm just saying). I'd still do it for a 2nd or a 1st too, but the margins will be less outrageous.