Bayern Munich will remain a strong challenger to Leverkusen next season even though they do not have an experienced coach because in terms of experience Bayern Munich is a strong team with complete players in all positions. Leverkusen has the opportunity to retain the Bundesliga title as long as Xabi Alonso can maintain the quality of his players and not let the opportunity to play in the Champions League be an excuse for not playing consistently in the Bundesliga.
It's not easy to defend the title with the minimum number of players and last season's moments are difficult to repeat. Bayern Munich and Dortmund have new coaches so they have to be able to adapt beforehand so this is the best step for Leverkusen to maintain their title and play more solidly.
It will not be easy for Leverkusen to defend the title even though Bayern Munich with its new coach next season will not necessarily perform well.
Bayern Munich is the team that dominated the Bundesliga before last season that dominance was broken by Leverkusen so of course there is greater energy from Bayern Munich to win the Bundesliga title again and apart from their new inexperienced coach I think their squad is very capable will help Kompany (Bayern Munich's new coach) adapt quickly and develop the team's performance.
And also several other Bundesliga teams are also starting to develop, so that will make the competition much fiercer.
I predict that next season the Bundesliga title competition will be contested by more than 2 teams, and that will make the Bundesliga much more competitive.