I mean, this would be incredible. Not only would we have one of the best PGs in the game locked up long-term at an incredible value, but his discounted price would allow the Cs to spend quite a bit extra on a mid-level piece - maybe even keeping Smart AND Rozier.
But it is not even remotely likely - and, really, who could blame him? Extensions really don't favor star players - especially if they are on pre-cap jump max contracts.