It is also a good reason for the Pats to continue what they have been doing all along...draft a QB late and try to develop him. If he's good, like Brady, he can be developed and worked in slowly without the intense media and fan scrutiny, or can benefit the franchise when he or the incumbant is traded.
I like that strategy...sometimes you get a Rohan Davey or a Kliff Kingsbury, but sometimes you get a Matt Cassell or if you're really fortunate, a Tom Brady.
A bad pick with the consequent cap hit, like a Ryan Leaf, can do major damage to a franchise and set them back for years.