It doesn't matter bc Pop will have to move on sometime. Don't let the death of Ms. Pop all of a sudden cloud your judgement. He's lost some of the sharp edge, not all life is basketball, there's planets, there's white rhinos, there's Trump, there's race, there's a bunch of stuff that distracts him. It's going to be time sooner or later and not very far off. Not sure Messina is that guy but I liked the adjustments he made, which Pop had not. Not earth shattering stuff bc he doesn't have an earth shattering roster but Pop wasn't doing any better.
Spurs will lose this series anyways bc Durant is the best player in the series and he can take over with ease. When someone like Klay goes off on top of it, then it's over.
Anyways, not sure Pop will retire next year. We are unknown territory.