From what I've see so far, Jets should NOT keep Revis
I want to start by saying I love Revis, but after watching the first five games the Jets have the same problems they would have had with Revis on the field.
I believe if Revis wasn't hurt the Jets would still be 2 and 3.
Putting $12mm into him would simply be a mistake. (basically 10% of your entire cap)
Putting $10mm into him would still be a mistake.
If you can sign him for $8mm a year you do it, but that's NOT going to happen. Trade him next year, or even now if you can and get what you can for him.