Bayern Munich did not win the Bundesliga because of Tuchel. Bayern Munich would not have won the title if Dortmund had won their last match. Moreover, Munich's performance has further deteriorated since Tuchel took charge of the team. Munich does not play well in Bundesliga matches either. However, the Munich management will definitely give Tuchel enough time and money to work. If Munich do not transform into a strong team by the middle of next season, then the Munich management may once again look for a new coach by sacking Tuchel.
Even while Bayern Munich declining play and failure to win the Bundesliga under Tuchel raise questions it would be premature to pin their problems entirely on him. Numerous factors especially the performance of opposing teams like Dortmund, affect the results of football games. Since frequent coaching changes might not produce the intended outcomes Munich administration has showed faith in Tuchel by giving him time and resources. Munich should be judged on their overall record not just their performance in the Bundesliga. Recognising that developing a successful squad takes time and requiring patience when switching to a new coach and playing style. The administration of Munich will probably evaluate Tuchel development holistically taking into account both on field outcomes and the underlying development within the club.
Bayern Munich's performance has been erratic since the sacking of Julian Nagelsmann. But we can't blame Thomas Tuchel for that. Bayern Munich management sacked Julian Nagelsmann at a strange time. Such a decision was taken by the management before the crucial match against Manchester City. However, players need time to adapt to a new coach's formation or match strategy. Tuchel will also find Munich's weaknesses now. And Tuchel needs to be given enough time and opportunities for that. It is expected that Munich's performance will be more organized in the next season.