Do you really want to get into this? You have no idea what the hell you're talking about, in terms of what BB thinks. Has he thought about the future of the position? Obviously, as he made clear when he explained the JAG pick in the first place. But, when you make the leap from that to your position, you're just guessing, nothing more.
This is from March of this year:
Belichick on Brady: No QB I'd rather have
Does it mean that Brady will be the team's QB into his 80's? Of course not, but it does mean that BB is still looking at him as the man he wants running the show.