In my opinion, this season will be very difficult for Bayern Munich to be able to defend the Bundesliga title, there are several teams such as Leverkusen, Stuttgart and also RB Leipzig who have experienced an increase in team quality so that it is possible for these teams to be able to tackle Bayern Munich and also Bayern Muncih this season. not very consistent and in my opinion there has even been a decline in quality since being coached by Tauchel.
However, things like this make the Bundesliga more competitive and more exciting to follow.
Leverkusen performance has been very surprising this season, they managed to reach the top of the standings due to their impressive performance. Bayern Munich dominance began to be disrupted after several other teams started to perform well, several of the teams you mentioned above are a threat to Bayern Munich in fighting for the Bundesliga title this season.
I really want to see another team become the new champion in the Bundesliga after being won by Bayern Munich for so many years. Xabi Alonso career will be even more brilliant if he can lead Leverkusen to win the Bundesliga this season, he could be an alternative to fill the Real Madrid coaching chair when Ancelotti officially leaves Real Madrid at the end of the season.