Given the changes made by the Bundesliga teams for next season, I don't think anyone doubts Bayern Munich's ability to defend their title. Indeed, none of the top Bundesliga teams have made significant changes to match Bayern Munich's strength.
Their success in acquiring Luiz Diaz certainly has the potential to significantly sharpen Bayern's attack. He is a highly qualified player, and the decision to join Bayern is certainly the right one for him, as he desires more playing time.
I also remain quite confident in the ability and quality of the players in Bayern Munich's squad next season, despite the acquisition of one of the best players, Luiz Diaz. However, the real concern is that the Bundesliga will no longer be a competitive league if no team is able to break Bayern Munich's dominance next season. And that could certainly trigger some people to lose interest in the Bundesliga because they already know who will be crowned champions at the end of the season.