So far the number of defeats suffered by Bayern Munich has reached 5, which is exactly the same as the number of defeats they lost last season in one season in the Bundesliga. Falling at the Allianz Arena was a big surprise, because Tuchel squad usually appears dominant when playing in front of its own supporters, Dortmund seems to have managed to exploit their weaknesses very well, so they managed to take home 3 points. It is clear that Bayern Munich is now in doubt that they will be able to play well when facing Arsenal in the Champions League, their erratic performance means their chances are lower.
In the Bundesliga itself, Bayern Munich might be able to recover and appear consistent again until the end of the season, but that will not open up opportunities to compete again with Leverkusen. Meanwhile, in the Champions League, Arsenal has now developed into a team to be reckoned with, with their unstable performance it will be very difficult for Tuchel squad to beat the Premier League representatives. For a team like Bayern Munich, defeat is considered a setback, because they have been the rulers of the Bundesliga for the last ten years.
I think it would have been better for Bayern if they had parted ways with Tuchel immediately instead of keeping him until the end of the season. To be honest, if you look on Bayern Munich's performance in the last few games, I see Arsenal as the clear favorite in the CL. Somehow I also have the feeling that Tuchel isn't taking it all that seriously anymore. Dortmund were well prepared today and Arsenal will definitely prepare just as well.