I really don't know what's wrong with this Bayern team, because they have everything in that team, but their performance have really been below the standard required for a team like Bayern.
Right now I think that the league title is really far off away from them, but nothing is impossible, anything can still happen, but they need to start winning games back to back for them to stand a chance and capitalize on any slip from Leverkusen.
In football nowadays, the bad performance of the team is always placed on the manager, so I see tuchel being sack between now and the end of the season because his performance as a Bayern Munich manager have really been terrible during his short stinct at the club.
If you look back a little to last season, Bayern Munchen experienced 5 defeats and 8 draws in one season but they managed to win the trophy. This means that Tuchel cannot be completely blamed, it is true that the squad depth he has is better than last season, but sometimes that cannot make a team achieve instant success. Last season's competition when they won the Bundesliga trophy was also very different from this season, their dominance was almost broken by Dortmund in last season.
The main factor why Bayern this season seems to be going backwards is the rise of Leverkusen strength, so far Xabi Alonso fleet has not suffered a single defeat. That is the fact that makes Bayern seem to have made a mistake, even though in fact their current statistics are still better than last season in the context of the number of wins and losses in the Bundesliga. Eliminated in the DFB Pokal, and beaten by Lazio in the Champions League, made Bayern look like they had committed a big sin.
Opportunities are still open for Tuchel and his fleet in their efforts to maintain dominance in the Bundesliga, and go further in the Champions League, despite having to be eliminated too early in the DFB Pokal. However, I predict Leverkusen will succeed in winning the Bundesliga trophy this season, and regarding Bayern's journey in the UCL, I think they can advance to the semifinals. That's just my assumption, it could be completely wrong.