I think it Brady was single, he's play until he's 50.
But he isn't and it sounds like for the first time, he is looking at his family and is seriously contemplating walking away. And walking away with his health and body intact. He's been lucky, he had one season where he had a serious injury that ended his season and that was 15 years ago...He has young kids and going to bed at 7pm or whatever he does during the season must really cut in to his family time. You can't blame him, his kids will be all grown up in the blink of an eye.
And I agree that Tom likely knows full well that Arians is just not good enough for his standards.