Revis' coverage ability has as much to do with his reach and upper body strength as anything else. His ability to control guys off a jam is incredible. I don't know how fast he is/was/will be but he should be able to cover for a long time because he doesn't rely a ton on speed.
I am no expert on Revis but saw this on some other board.
Who knows how this will turn out, however right now Jets fans are not happy and Bucs fans are celebrating. Only time will tell.