The situation in Bayern Munich team last season proved that something was lacking in the team despite the signing of Harry Kane so if they try to do a good job in the transfer market as they have always done it will help to transform the performance of the team and it will help them to move back to the top level where they will find it easy to challenge Bayer Leverkusen and reclaim the top spot from them. Yes I agree that the Bayern Munich team had an unsuccessful season last season as they failed to lift a trophy after making notable signing but they have a great team right now and a new young manager who is expected to make a different this new season so hopefully they will eventually win the domestic league and get better in 5hr other competitions with the quality they have got so far.
Changing coaches will change everything, in a football team the most important thing is the coach's tactics and that has been done by Bayern Munich to change their team's performance next season.
And what must also be realized is that this season everything is different from what happened last season, we can see the development of other Bundesliga teams, especially Leverkusen who managed to break Bayern Munich's dominance to win the Bundesliga title, making the competition in the Bundesliga much fiercer, and not only Leverkusen but also several other teams have had quite drastic performance developments that make it not as easy as before for Bayern Munich to win the Bundesliga title.
So for next season I think anything is possible for Bayern Munich, and what is certain is that they will not easily win the Bundesliga title and even the percentage for that is not that big.