The Patriots will have to pay pretty close to top dollar to keep Revis, so I can definitely see some team making a better offer and him leaving. However, there will be enough teams willing to do that that, if he does decide to leave, he's going to go to another contender who's willing to pay more than the Patriots, not to a 4-12 team with no quarterback.
People always call Revis a mercenary, saying he wants to maximize his earnings, which is probably true. But it's not like we have evidence that says he's willing to play for a dumpster fire if it means the most money. He held out for more money on a Jets team that was going to AFC championship games. He was then traded to the Bucs (didn't choose them), and signed with the Patriots as soon as he had the freedom to choose. The idea that he might take a marginal increase and play for a non-contender is based on nothing.
