If he truly wanted a new challenge, their are far better, more preferable options Tomlin could choose from to take on and rebuild other then some perennial, continuous endless migraine that is being a Cowboys HC under Jerry Jones. At the end of the day, it's just not worth the perpetual insanity and internal frustration he'd face trying to build and construct a new identity in Dallas with Jones' incessant meddling no matter how much more money Jones could offer him.