It is worth bringing in another QB. Mallett wont be in Foxboro when Brady finally retires. He has a long road to run. As a measuring stick: Peyton will retire first, probably 2 or 3 years ahead of Brady.
I would say a draft pick at QB... a late pick... would signal to me that BB intends to find a home for Ryan elsewhere in the next year or two. And that seems like smart money.
For some QB desperate team to give up the 2nd rounder that would move him, they would have to be enamored with Ryan's college film, or they have to have been coaching on the Pats practice field over the last few years. Short of that, why make an investment of that magnitude?
After watching the Cotton Bowl, while Manziel was pretty impressive-- just a natural multi-dimensional player (we'll never draft high enough to even sniff that guy)-- the QB I thought BB would be interested in was Landry Jones in the losing effort. Here's what I liked: kid was poised, called the offense and the protections, set the tempo, scanned the field, had a clean arm motion and an accurate ball, moved in the pocket with his eyes downfield. He never lost his head even down three+ touchdowns. He's a guy that fits our system.
The fact that A&M was a wildly superior team is really not in Jones's control. I don't think the kid is a ready-now starter, and best of luck to any team who tries to win behind him as a rookie. But do think he's a legit prospect that I think BB could grow into an elite player, ready to take the field in a few years.
If (big if, and unlikely) someone gives us a 2nd or even an early 3rd + loose change for Mallett, I could imagine spending a 3rd on Landry and signing a journeyman veteran for QB depth.
And if no one is interested in our backup, which is more reasonable, spending a late pick on a third QB is still not out of the question. The fact that Jones lost his Bowl game helps us in that regard, because he'll drop lower and maybe into a zone where BB sees value. It comes down to a judgement call, whether drafting another QB project like Jones, is a luxury when we could use that pick at WR, OG or DB instead... a true FB would be nice, too. But maybe we solve those things in FA, and take a young OU QB on Day Two. I could go for that.