Xabi is a good coach so far, he managed to make a team that had never won the Bundesliga title get it even with a questionable team composition. For me, his achievements are the result of luck meeting the right time, when they won the Bundesliga, Bayern Munich & Borussia Dortmund were in chaotic form, just look at second place in the standings, is it Bayern Munich or Borussia Dortmund? no, it's Stuttgart.
There will be no more Bundesliga titles for Bayer Leverkusen in the future, no more.
Regardless of luck or not, Xabi Alonso succeeded in bringing Leverkusen to win the Bundesliga. This is an extraordinary achievement for Leverkusen and by relying on the limited strength of Xabi Alonso, he has succeeded in realizing the club's big dream. Despite the disappointing performances of Bayern Munich and Dortmund, the presence of Xabi Alonso was able to take advantage of this condition so that he succeeded in winning the Bundesliga title.
But talking about next season it will be different and I have the same belief as you because if you look at the history of the Bundesliga it will never change from the strength or dominance that Bayern Munich has. Xabi Alonso can make bigger history if he is able to present the trophy again next season, but relying on strength like now feels difficult.
Bayern Munchen and Dortmund have changed managers, Xabi Alonso can make good use of this as a convenience, to help his squad retain the Bundesliga trophy next season. Amid increasingly high expectations for Leverkusen, it is possible that they will slump, so that Bayern Munchen will take over dominance again. So far, Xabi Alonso has still been able to keep most of his players from leaving, and Leverkusen is also trying to add depth to the squad by recruiting new players such as Aleix Garcia.
To repeat the unbeaten record throughout the season, it will not be easy, and requires great luck. What is more important is to defend the title, and try to appear consistent in every competition they participate in. Xabi Alonso doesn't seem to be losing his magic so quickly, his chances of leading Leverkusen to success are very open. Personally, I am quite curious about their journey in the Champions League next season, apart from various assumptions, I think they still will be able to talk a lot next season