This season has been a beautiful season that Alonso and Bayern Leverkusen will probably find hard to forget if they are able to win the Bundesliga. Currently, Leverkusen is ten points ahead of Bayer Munich, which means it is very difficult for them to catch up. Apart from that, Alonso was also able to set several records which made him shine even more as the most successful young coach. I am pessimistic that Bayer Leverkusen will be able to keep him because several other giant teams such as Bayern Munich and Liverpool also really want his services.
You are right, this season is the season that Leverkusen has really been waiting for as long as they are in the Bundesliga, getting the league title is the dream of every club and this season Xabi Alonso was able to record the first title for Leverkusen and this is of course very encouraging for the club and for the coach himself because he has shown that a lot of experience does not necessarily guarantee that a club will win the title. He is a very talented young coach that makes big clubs try to get his signature. Leverkusen will try hard to retain their coach at any cost, but this decision depends on the coach himself whether he is willing to stay or leave Leverkusen.
Bayern Munich and Liverpool are 2 big clubs, it is difficult for a coach to refuse offers from these 2 big clubs, but after all Leverkusen is a club that he coached from the bottom and was successful in getting the title leaving Leverkusen like leaving shards of glass which might be painful for Leverkusen itself who are trying to perform well in the Bundesliga and compete with big Bundesliga clubs, especially next season Leverkusen will compete in the Champions League if Xabi Alonso no longer trains Leverkusen this will make things difficult for Leverkusen's.