Revis is the key to the defense. He makes everything else work. They have to bring him back, they could have easily lived without McCourty, Browner can only handle certain receivers. He is great when he has a Revis or a Sherman on the other side. Seattle (now that they have lost Maxwell) will certainly overpay for him. The Pats should just pay him his contract, because he is not going to come cheaper.
But the very real situation exists that next year you will have a secondary of Arrington, McCourty, Chung, and Dennard. Even Geno can kill that secondary!