The good news is that, Manchester city will defeat Bayern munich again in the champions league second leg and it won't be business as usual.
Bayern even went ahead to hire Tuchel. Tuchel is not a bad coach but I don't think he can do what Bayern expect from him. Bayern was not doing badly under Nagelsmann, they were not playing as well as they were playing under Flick but they were not bad. If they had sacked him when Bayern was struggling immediatly after the world cup it would have been understandable, but sacking him when the team was just getting better and regaining their rhythm is very questionable.
I expect Man City to win Bayern at Alliance Arena. Tuchel's Bayern Munich have not shown any signs that they can win Man City, let alone turn the tie around. Lets just prepare our mind for a semi final of Man City vas Real Madrid.