I see your point, but Revis is the best CB in the NFL, or has been at least. I understand there was an injury, but the ACL doesn't scare me. Look at Adrian Peterson. I think Revis will be ok.
The contract status and all that only hurts the Jets bargaining power. We don't necessarily need to resign him. But a shutdown corner changes things, no matter how good our corners might be presently. Players like Revis can go a long way towards a championship run.