They have some players who can take over, but not like Harry Kane does as he is all about the center forward position and otherwise they have a change in their system, which I think a team shouldn't want to have too often.
Kane has indeed become a mainstay of Munich and he does not have a worthy replacement in the team. Muller is also not as good as he used to be and I heard that Munich will soon be looking for a new replacement in January for Harry Kane. For now, looking at the provisional ranking in the Bundesliga, it seems that Leverkusen has returned to the championship competition this season. Xabi proved they are not a team that only passed in one season and was thrown far in the top ranking. Munich's first defeat made the point difference also smaller. They still have 4 matches left in the middle of this season. They also still have a lot of games in the second half of next season.