I think even if Bayern Munich fails in the Champions League and is eliminated by Lazio, then they will realize that there is no one to blame anymore considering that they couldn't fix it from the start. However, even if Bayern Munich qualify, it won't change anything other than saving them from embarrassment in the higher rounds and previous expectations which placed Bayern Munich as one of the finalist teams in this season's Champions League will have disappeared.
Correct, in the end Bayern Munich won't become a champion, but it's really embarrassing if they gets eliminated by Lazio, I'm sure Tuchel would be fired a day after they lose. 
Mark my words, the champion in this season are either Manchester City, Real Madrid or Inter Milan, the rest don't have any chance. I think this time should be Real Madrid, even Girona was overtake them, but they can regain back their position and stand strongers.
The so much hope you have in this teams that will win the champions league is very surprising to me. Why not feel the same way for Bayern Munich too. Before now, Bayern Munich was amongst the potentials that will win the champions league trophy but as time goes on, their performance in the domestic league got declined and people now think they can’t be a contender for the champions league trophy anymore.
Their weak performance in the league and their poor performance in the first leg of the Champions League isn’t enough to conclude that they will not make it to the next round of the champions league or won’t be a title contender this season. Those leagues differ and they will do anything in order to have a good record in the Champions League this season just like they’ve been doing it prior seasons.