I truly think he is going to leave. I view Revis much like I do Peyton when it comes to contracts. They always want to be the highest paid player at their position by a fair margin(personally would do the same). Sherman money isn't high enough for a guy who is possibly still in his prime and coming off a super bowl victory.
It would suck if he leaves, but as long as Gronk and our offense in general stays healthy our chances to repeat remains about the same imho. Our offense really showed up this post season not really our defense. Besides the Colts, we didn't really keep the Ravens or Seahawks off of the scoreboard. BB will somehow make our defense good enough regardless if we lose McCourty and Revis. See 2011 year with Sterling Moore playing the role of Malcolm Butler to a far lesser degree.