In essence, if Xabi Alonso really wants to leave Bayer Leverkusen then of course, I am sure that next season Bayer Leverkusen will not be as good as this season. Unless, for example, Xabi Alonso still stays at Bayer Leverkusen for next season, then this will make the title competition still a difficult competition. But anyway, if Xabi Alonso really leaves then yes, of course Bayern Munich will again to dominate the Bundesliga even if only with Tuchel.
But unfortunately, Bayern Munich has decided to terminate Tuchel contract at the end of the season and therefore, we will wait to see who the new coach Bayern Munich will next season to replace Tuchel. Because yes, if Bayern Munich appoints a better coach than Tuchel, then it is certain that Bayern Munich still has a chance to dominate the Bundesliga again next season.
For sure, we cannot be sure what will happen even after Xabi Alonso's eventual departure from Leverkusen. Maybe the club will get a coach who is as ideal as Xabi Alonso's successor. after all, there are no guarantees at all in this matter. It could be that Leverkusen will slump after Xabi Alonso leaves. Or, Leverkusen will actually get stronger with its new coach. In fact, there is no guarantee that if Xabi stays with Bayer Leverkusen, next season could again put pressure or competition on Bayern Munich. the reason is, we all know that Thomas Tuchel has agreed to end his career with Bayern next summer. and what is certain is that Bayern Munich management will look for a more ideal coach than Tuchel. so, in football there are lots of possibilities.
After all, it is not certain that Leverkusen will be able to break Bayern Munich's dominance so far. remember, there are still 11 matches remaining. plus, Leverkusen is only 8 points different from the Bundesliga giants. at the very least, to secure Leverkusen's position towards the title, Xabi Alonso's team must win at least 8 matches. that way, even though Bayern Munich swept the rest of the match with all the wins. Thomas Tuchel's team will not be able to match the difference in points achieved by Bayer Leverkusen.