Almost every season we see something like this, several clubs are able to provide tough competition to Bayern Munich at the start of the season but slowly they fail to remain a strong team, or like last season when Dortmund failed in the final match which was very decisive so that they had the opportunity to break their dominance Bayern Munich failed again.
Wolfsburg and Schalke were once in a position like Leipzig and Leverkusen continues to stick closely to Bayern Munich but again the champion is Bayern Munich and perhaps the Bundesliga is the only big league whose league champion can be predicted with a fairly high percentage of correctness every season, sometimes it gets boring, especially when the championship title can be confirmed even though there are still quite a lot of matches left.
What you say could come true even though seeing a new champion would be very exciting and make the league even more interesting to follow, unfortunately when the previous season Bayern Munich experienced quite a lot of difficulties usually they will perform better the next season and that is starting to show this season.