Yeah they definitely missed a huge opportunity for a title this season. It's clear Nagelsmann is a very talented coach and I understand he's from Bavaria so not very likely he'd turn that down but it's still a gamble from his POV considering he's not won anything at this point. If he doesn't hit the ground running, particularly in Europe, Bayern have never been the type to hide away from making a change regardless of the talent of the coach.
Yep. Bayern Munich isn't going to be an easy ride for him. With Alaba and Boateng they're losing core figures on the pitch, Hoeneß is gone, Rummenigge is gone in July. Salihamidzic is still a somewhat dubious figure and mostly known for signing duds and his problems with Flick. Nobody knows how Kahn will do as their CEO, he's never worked for a club before. While Neuer may well play on til 40, Lewa and Müller are outfield players who don't get any younger.