Exactly, Bayern Munich has a big challenge this season that cannot be underestimated. Leverkusen and Dortmund, at least those two clubs will be their tough competitors.
Especially if we look at the last match Bayern Munich vs Wolfsburg, even though they won, their game was not effective and accurate enough.
Check these statistics:

Google/bundesliga-wolfsburg-vs-bayern-munich
They have 71% ball possession, but only 8 shots on target, and only 2 goals created + 1 OG
Trying t think Leverkusen and Dortmund will perform any lesser than they had done in months most recent times would be a very dangerous underestimation which may be a huge problem to Bayern Munich and I believe Bayern Munich are never going to do such because they know for sure that these guys have go their eyes on the trophy and aren't going to stop trying for any reason until they are able to get to win the trophy. Bayern Munich has got a whole lot to tackle at this point especially trying to get their stance with their new coach who's still figuring it out around the bundesliga. Against Wolfsburg they did tried but that performance isn't the type they will go against bigger teams with, even with them having the most possession, they still were able to show the perfect dominance by the score line.