Yes, and the Pats once went 11-5 without Brady. That does't mean the first thing they should have done is trade Brady to make room for his cheaper replacement. The truth is that Sanchez was not a good QB and the team went 6-10. If Sanchez was a legit QB then this cap issue is even less real than it already is, Revis fits perfectly into the plans, and the Jets have themselves stars on both sides of the ball.
What's making it alot harder to have good players is that they have not drafted enough of them. That is not connected to Revis. You put him on the market and any team with any interest in winning will be looking to acquire him. Trading Revis doesn't suddenly improve the Jets, and the chances of it gradually improving the Jets are overstated/overrated at best. Great franchises keep their great players, period. Having Revis does not halt the search for a QB. The Jets are certainly not going to run into one on the FA market that will break the bank and force Revis out. The next QB will be through the draft, and being a draft pick will be cheap through the meat of Revis' next deal.
The Jets have a talent issue. A depth issue. Paying Harris 14 Mil per year, Cromartie around that amount and Revis 16 mil per yer limits the Jets ability to sign, draft, pay players at other key positions. Thats the problem. A CB is not worth being the highest paid player on your team. Not even close.
The reality is was the Jets defense that far worse this year without Revis? No.