Even if Bayern didn't win the first game, I don't think that matters for the league. Simply too good. It must be said, however, that clubs such as RB Leipzig are getting closer and closer and Dortmund can never be ruled out. I don't know if Haaland will stay.
It was expected before the start of the season that Bayern's dominance in the league would be somewhat reduced and Lipzig and Dortmund would compete for the title. In this situation, if Bayern want to win the title, thay can't lose any points against the weaker team. Bayern will have to play more carefully and better if they want to win the title.