I do think it's possible that there's a coach out there that does get through to him/a wake up call like this helps take him to another level, but yeah, there comes a time where you gotta think it might just be who he is.
It's a shame because he clearly has the athleticism to be a plus defender and though it's essentially only standstill shooting, he's still very very good at that. If he turned himself into a good defender, he'd be a really valuable player and even a potential NBA guy, but he hasn't really shown any development on that end in his time here and while he made some minimal strides offensively, that's just not enough.