It's going to be a long run for the Bavarians, but not to worry because the Champions will always come out to be the very best. Borrusia Dortmund and Bayern Munich are the preeminent rivals for Bayer Leverkusen. The Bundesliga title becomes very competitive and running for the elite league. Bayer Leverkusen have incredible odds to meet next season, they have to fight their way through the economical paths and hitting the top targets.
After the previous season was impressive, I am not sure Leverkusen will be able to repeat the same thing as last season. As many analysts said overall Leverkusen actually only has a "mediocre" squad. But the perfect tactics made by Alonso for Leverkusen have made them a very solid team. But this team has a weakness when they meet a team that applies high pressing one on one. Munich is the favorite to win the league but honestly I am not sure about Kompany whether he will be successful in his first season or not. On the other hand Dortmund has been almost inconsistent throughout the season. This makes them always behind Munich.
I also don't think Leverkusen can be able to maintain their stand again because the way they played their pre-season matches wasn't encouraging, even though it doesn't required much serious but shouldn't face the kind of embarrassment during pre-season against arsenal, Bayern Munich are really ready to do anything possible to take back what have lost them, Leverkusen will find it difficult to maintain the unbeaten this season. Among the three teams you mentioned only bayern Munich are currently doing well while the both remaining two are equally on the same track that is have like similar performance.