I never think Leverkusen can match their unbeaten record next season, but everyone can expect logical things about them next season. Xabi Alonso has a big responsibility to maintain his team's performance, this is the most difficult challenge I imagine for him next season.
It is very difficult to maintain the success that has been achieved, every time a new season rolls around there will always be an increase in competition and different performances displayed. However, I still believe Leverkusen will be the toughest competitor for Bayern Munich and Dortmund next season because they still maintain the squad that has won trophies this season and will likely bring in new players to add to the team's strength. Xabi Alonso responsibilities will be even heavier next season because Leverkusen will play in the Champions League, the level of competition which is more competitive than the Europa League means that Leverkusen must perform optimally if they want to survive longer in this most prestigious competition.
Leverkusen have surprised everyone this season and won the league title with a brilliant performance. There were some stronger opponents in the German league but no team did well against them which is why they ended up going undefeated and securing the title. Their unbeaten run this season will undoubtedly give them confidence going into the season ahead. If they continue this form next season, it is possible to do well against the other strong teams, including Bayern Munich, and beat those teams.
A tough challenge is definitely waiting for the manager in the upcoming season. Hope the manager is ready and the manager's boys are also ready to do something great in the upcoming matches.
Although I have the same thoughts as you but there is a small doubt in my heart about Bayer Leverkusen, where he might have the same fate as Napoli, the previous season Napoli was also on fire they could be said to be very good in the Serie A league to be in the past season with very good dominance, even the Milan team could not keep up with what Napoli brought last season because they were much more consistent and very good performance.
Is this likely to be repeated in Bayer Leverkusen in the season he will be in the champions league because yesterday he got an extraordinary victory and with his unbeaten status, I am very proud of that for Xabi Alonso, but how will he be next season will it be that strong again or even more? because we see that many of his competitors are preparing themselves and strengthening their troops much better than before, maybe what Napoli feels will also be felt by Leverkusen? this niggles in my little heart.
I don't think that Leverkusen will end up like Napoli last season in the next coming season. The reason why I said this is that, there was a problem that made Napoli performance to drop and they started struggling on winning matches. Which is the absence of Spalletti, who left the club for Italy national team, and different coach took over who found it difficult to understand the players.
Xabi Alonso is still the coach of Leverkusen and nothing changes, which means that he can strengthen the club's performance better than last season because he knows that he has a big challenge ahead of him. Playing in the Champions League is quite big for Alonso. He might not be able to maintain his unbeaten record but he will do better next season.