Point is that Leverkusen was on a different level. I have no idea whether they will be able to repeat that, but fact is that this performance was so out of this world that I can't think of a situation where they will repeat it. If it is the case, I am the first person to salut!
No other team has been able to surpass Leverkusen level this season, they have managed to lock in the Bundesliga title with an undefeated record, now Xabi plans to close the season as a team that has never been defeated. I think it's difficult, the team's performance is always different every season, there will always be unexpected events that make the team perform less than optimally.
An unbeaten record in one season is very difficult to achieve because not all teams can do it, maintaining this record is more difficult than achieving it. Xabi stay as coach is certainly good news for Leverkusen and bad news for Bayern Munich, next season there will be even more competitive competition after Bayern Munich realizes that there is already a team competing with it in the race for the title.