It's a matter of the market.
He will very likely be offered less.
Consider: the league is about to go through a huge salary cap crunch as the NFL is going to lower the numbers. A lot of star players will be cut. Many will sign for much less. Belichick is the last person who will hamstring himself in an enivronment when there will be so many free agents looking for deals with teams strapped against the cap.
Not to mention that the vast majority of teams are not looking for QBs right now.
At the end of this year, it may only be Cleveland, Jax, maybe Washington, Carolina (not even a suitor for Cam), maybe Tampa if Brady retires. & when you add Justin Fields and Trevor Lawrence as top 5 picks, I see only 2 landing spots possible.
Cam has basically no market.