It is going to be very disappointing for Bayern Munich to lose their title chance this easy. But they totally deserve that after this huge loss against Leipzig home. They just gave up on the title before their supporters in Allianz Arena. There is nothing more humiliating for them I guess. But I believe it would be very unfair to judge Tuchel harshly for this. He hasn't even managed the team for a long time period.
Nagelsmann brought things to this point mostly as you already know. It would be the funniest action to take for Bayern Munich if they sack Tuchel only a short time after he joined. I know that it is very annoying for Bayern Munich fans. But I think that this is totally related to the players rather than Tuchel. They just don't play like they believe in themselves completely sometimes.
These things have been dropping down the team into a worse place. Plus Bayern Munich absolutely need a striker like Lewandowski immediately.
The dismissal of Nagelsmann was very unexpected, I'm not sure if there were any really weighty reasons for this, and this decision ended up being wrong. Bayern played very badly yesterday, especially in the second half they couldn't create anything dangerous, the team didn't show any character, they just didn't know what to do. And the fans were upset with such a game, 10 minutes before the end of the match, I saw huge queues of fans who were leaving the stadium. Stuttgart won their game, so Augsburg need points, let's see how they play against Dortmund, and if they give Bayern another chance.