There is nothing Bayern Munich will do this season that will stop Bayern Leverkusen from winning the Bundesliga title this season. Bayern Leverkusen has played 27 matches this season without losing any, and I don't see them doing it now. Bayern Leverkusen is separately on a different level in the Bundesliga, and no club can stop them in the Bundesliga this season.
I believe Bayern Munich can stop Bayer Leverkusen from winning the league this season since they have not performed as well as they did at the start of the season. If you look at Leverkusen's performance in the last two games, they appear to be a team that is becoming weak; their opponents received red cards, yet Leverkusen only scored two goals; even without the red cards, I expect Leverkusen to score more than two. I'm still doubting them today against Freiburg, despite the fact that Leverkusen thrashed them at home 2:1. If they don't maintain their winning ways, Leverkusen may end up draw or losing to Freiburg, giving Bayern Munich a chance to reduce the point gap.
Xabi Alonso and his team should not disappoint their fans by wasting their chance to win the league this season, they are already at the top of the league with a 10 point lead over Bayern Munich; if they beat Freiburg today because their performance in the previous two games was not enough to maintain their current position, I believe their unbeaten streak will be broken before the end of the season against unexpected opponents.