Xabi Alonso plays an important role at Leverkusen. Leverkusen managed to show that they are capable of becoming champions this season. I really hope that Leverkusen can win again in next season's match. Even though it looks like they will have difficulty achieving this, I am sure that if Xabi Alonso is still willing to become coach at Leverkusen then they will win again.
The condition of Bayern Munich as a team that often wins in the Bundesliga is not good. On average, the great players that Bayern Munich has have left and moved to other teams. But when the player transfer market opens again, there is a possibility that Bayern Munich will buy a great player and might become a big threat to Leverkusen.
I do not think that it would be that simple, just because he is still the manager doesn't mean that they are going to win the title again or even be all that great. I think it's quite obvious that Bayern didn't learn from their mistakes and hiring Kompany as manager, a person who did not do all that well at premier league, and never managed a big club ever before, managing Bayern will not end with a good result, it is going to still be a problem for them.
I think it is clear that Xabi and Leverkusen still has a chance, and we may see them do fine eventually. We should consider the possibility of Leverkusen only being able to do fine, if Bayern does badly because I do not expect Leverkusen to have a similar season to this season.
Bayern Munich may have made a risky decision by appointing Vincent Kompany as head of the team, but it is clear that they hope for a coach like Xabi. They also paid a high transfer fee for him. Kompany must teach the team the best tactics. He had a great career as a football player. He is a coach who can solve Bayern's defensive problem this year because he knows everything about defense very well. It is certain that they will have a tight race with Leverkusen next year.