Here's the difference. Parcells came in and immediately brought in his people, his veterans, guys from the Giants and Pats.
This is being built from the ground up, through the draft. The Jets still have one of the youngest rosters in the NFL. Joe Douglas is some sort of wizard, I am pretty sure. And Saleh has more than stepped into what the fan base expected of him.
This has much more of a feel of sustained success, long-term success. The more chances you have at a Lombardi, the longer your window stays open, the greater the odds of winning it all.
Anything can derail a team built to win short-term. An untimely injury. A bad call in a crucial spot. Running into a hot QB in the playoffs. But if you are built for sustained success, you get several grasps at the golden ring.