Tuchel is a very good Coach and Trainer for sure and Bayern Munich wanted him some years ago as he was in still in Chelsea.
I guess it is and was the whole situation inside the Club of Bayern Munich that has made some problems to the Team.
There was a lot of heat in the Club with the managment and all how the things where handled.
If all calmed down and the new season will be started we can say more about the future of Bayern Munich.
The fact that the club got rid of Kahn and Salihamidzic did not solve all the problems at all. For example, I see a problem with Neuer - he is old and after a terrible injury - he needs to be changed, but even the dismissal of his coach led to a scandal. In addition, Bayern should be strengthened by top players - against the background of other top clubs that buy tops, Bayern's acquisitions look weak. I think in the summer it will be clear that the next season for Bayern will be a failure/weak.