Many believe that Bayern Munich will not be German champion this season. I do not believe that. The other teams that are now in front of Bayern Munich in the table will not keep their form for the whole season. Freiburg and Berlin are playing internationally for the first time. That is a big burden for them. Hoffenheim and Dortmund will not make it easy for Bayern Munich though. But I do not think they will play at a high level the whole season.
Bayern have indeed performed poorly in the last 4 matches, but because the Bundesliga is still quite long, so it's too early to conclude that Bayern
will fail to win the Bundesliga trophy this season. As you said, not necessarily the 4 teams that are now above Bayern can play consistently until
the end of the season. So there's still a chance for Bayern to recover and reclaim the top spot. Moreover, the quality of Bayern's players is actually
very good when compared to other Bundesliga teams. The problem is that some of Bayern's new players still need to adapt, like Mane,
in my opinion, hasn't shown his best performance. I believe that towards the middle of the season Bayern will start to be consistent in their form.
Bayern do need time to find the best form. After all, Bayern's performances were very good in the Champions League, much different from
Bayern's appearance in the Bundesliga. This means that Bayern still has a chance to improve its performance in the Bundesliga.