Bayern Munich seems to have real problems. They can't blame the coach when the players aren't doing well and have no interest in winning any title. I read in the news that Oliver Cahn reproved the players after the match, because it seems Bayern lost everything this season, and all that happened in the last month. They got knocked out of the DFB Cup and the Champions League this month, and the Bundesliga is moving away from them after this loss. In the coming rounds, Dortmund has great opportunity to win the title as they won't face strong teams. On the other hand, Bayern has the same situation, but this performance won't help them a lot.
Kahn's dissatisfaction is understandable, Bayern approached the end of the season very weakly and now it is quite possible that they may be left without trophies if Dortmund ends the season in the Bundesliga without losing points. I don’t know if Tuchel can be blamed for this, to some extent his fault as a coach is also present, but Negelsman was fired at a very responsible time, and it was after that Bayern suffered the biggest setbacks.