Spring 2021 he did that TV interview analyzing Pirlos Juve, basically criticizing Pirlo and saying what he'd do differently + some of his other interviews last year make me think that in his mind 4th isnt the rightful position for Juve, its a failure.
Summer 2021 he rejects a Real Madrid post and comes back to Juve, apparently purely out of love for the club.
Im thinking that if there comes a point where he see's that for the 2nd season running he's failing and doing more harm than good and if the mgmt play their cards right and send the right signals, they could come to a mutual decision to not continue without a big payoff.
Gattuso did that for Milan as a coach. Marchisio when he was already broken gave up 2 years of his contract with Juve. 5 WC players went to play in Serie B once. I have no reason to doubt that Max really loves the club, which might make him make an irrational choice from a pragmatic pov. Thats what legends do, they put the team first.