Bayern Munich are Bundesliga giant, nobody can change that and they've come to become the very best. They beats all rivals when we're talking about all-time but this previous season have been their worst, they've failed to adhered to their current problems and having absolutely everything to worry about. Perhaps they've relieved their headcoach from managerial duties because he's incompetent and brought in the picture, Vincent Kompany. Bayern Munich have accomplished heavily when it comes to trophies won and they have all of them in their collection.
You didn't seem to State clearly what you think is the problem Bayern Munich may have, this season felt like a bad one for them and it's okay to think and feel that way because they are usually known for better performance in previous seasons , even by the records they appear like they enjoy monopoly of winning the trophy in years only at intervals just like this season other teams get to experience what it feels like to lift the league title.
The expectations of the management of the team and the fans probably might have been cut short and not met aswell in that they have not been in a position where they don't get to lift a single trophy by the end of the season and so for such to have happened this season, it was enough to have raised concerns and even influence the decisions the team a d management made which led to the dismissal of their head coach and I see it as an almost normal reaction most team get especially for such teams that have got a management thats not patient enough to give a lot of time to the head coaches.
I don't see failure to be a one time thing, I feel it appears like most persons are seeing it like Bayern Munich failed this season because they were unable to lift any trophy especially their domestic league title which is such that they get to win almost every season. Bayern Munich didn't fail and if not for higher expectations and probably impatience, sacking of their head coach wasn't really necessary, this is something that could happen to any team at any time even if tuchel didn't succeed we enough this season, he could have probably next .