The Patriots have a history of cheating going back to Spygate in 2007. As far as Brady is concerned he needs football, it's who he is, and right now his image is tarnished. He quits and the big bucks go away, no network is going to hire him as a football analyst (if inclined to do so) and pay him the kind of money he's making with the Patriots.
“no network is going to hire him as a football analyst”
But Ray Lewis will always be able to find an analyst job. That’s what the NFL wants, not Tom Brady.