Yes, even though Bayern Leverkusen won this season's Bundesliga title, Bayern Munich remains the best club in the Bundesliga league because Bayern Leverkusen has yet to achieve what Bayern Munich has achieved. Bayern Munich is the most successful club in Germany.
Since Bayern Leverkusen won the trophy, Bayer Leverkusen is clearly the best club in Bundesliga last season. However, you are right that Bayern Munich is still the most successful club in German because they won most domestic trophies. But the status of most winners in German never guarantees Bayern Munich to win the trophy for the next season.
I disagree that Bayern Munich has learned from their mistakes because we have yet to see them perform. When the new Bundesliga season starts, we will know if Bayern Munich will do better next season.
You're right. We don't know yet that Bayern Munich has got a lesson from their bad performance last season or not. Sure, we must take a look at the results of the early matches of Bundesliga in the next season. If some early matches get positive results, we can assume that Bayern Munich has learned much from the last season.
Bayern Leverkusen will rival Bayern Munich for the Bundesliga title next season, and if Bayern Munich is not well prepared for the new Bundesliga season, Bayern Leverkusen might beat them again for the Bundesliga title.
Definitely. If Bayern Munich isn't ready for the next season, Bayer Leverkusen or other top teams in Bundesliga will defeat Bayern Munich again. I am sure Bayern Munich is busy to prepare everything for the next season. They must target to win the trophy again, there should be some changes to be done before the season starts.