There is a much simpler answer to the question of the JETS. They simply don't have the horses any more.
Under the Brain Drain of Tanney and Woody , they have been trading their draft picks for aging stars. You can do that effectively for a year or two. Look how Belichick traded his 2007 draft for two future HOF receivers in Randy Moss and Wes Welker. But you can't do that for half a decade, as the Jester management has done. The aging stars finally go Over the Hill,and you have none to replace them.
George Allen could do that because he was ruthless and would promptly cut his own Mother when the vet showed signs of losing it, and sign another vet.
But Wrecks was handed a team with Classy Ladainaian, Bart Scott, Jim Leonard, Shaun Ellis and Woody, all discarded by their teams as oldsters, along with Braylon Edwards and Cotchery as his stars; and they all got old, or left, with out anyone to replace a single one.
Is it any surprise that they are now losing?
I think the Jesters are done for this cycle, without undertaking a total Five Year Rebuilding Plan. Only "The Belichick" can condense that rebuilding to three years with his double drafts, and still turn in winning, if not quite championship, seasons.
But his equals, like Paul Brown, Vince Lombardi and Don Shula are not available to coach the Jets. Wrecks doesn't have the ability, nor more importantly, the authority, to do what needs to be done.
