There's been only a select few QB's that have had the playing time in the NFL that Brady has had & nearly all of them are in the Hall of Fame, I dont see it quite that way TBH. (I'm pretty bad at playing sports BTW) If I was a successful NFL quarterback that has played for as long as he has, to play every week From August (pre-season) into February (Five months) & you have the ball for a few seconds for let's say 30-40 times a game, before three or four blokes over 6ft tall weighing 20-25 stone screaming obscenities at you & trying to land on top of you or push you to the ground while you still have the ball, I think that would be a little tiring. Once I'd reach 40 or so (I'm 53 BTW) & I'd rather be teaching the youngsters the tricks of the trade of being a top QB. All that time out there its going to take its toll in later life.