@MarjorieZimmermanGinger I personally believe that the key here was Dortmund selling them their key player’s and had Dortmund taken a stand of not selling them then it would have been pretty different for Bayern but then again Dortmund was always interested making money only so not really surprised that they sold to their direct rival. Furthermore other clubs failed because they lacked the winning mentality that Bayern has and until they learn to cultivate it they won’t win the league title.
Other clubs need to sell their key player to keep the club afloat but Bayern have a solid financial standing. If they don't sell their best, the club might not make a profit for the owners. So in most cases, these clubs don't give so much preference to trophies but how profitable the club is. These clubs can keep a coach who recruits and build young players to become superstars because it is one of their main source of revenue. These young players who were signed for a very low price will be sold for so much profit.
Bundesliga belongs to Bayern Munich because they've proven beyond doubts about their stand over the decades, we understands how dominated the team is and have inflicted frighten minds on their opponents when they clash. Borussia Dortmund would have been in that position but the team's board is all about making hugh profits from the sales of talented players in the club. Having no stands to fight with the Bavarians for the title because there's absolutely no current players left to fight, all have been sold to elite teams, I think is high time they start using these brilliant players to fight for Bundesliga title.
I can speculate that Bayern Munich is gradually losing its grip on the Bundesliga. It used to be a common practice for the Bavarians to comfortably win the league with sometimes few matches to spare. But is gradually changing like we saw last season when Borussia Dortmund lost the league on goal difference. It seems other clubs might also give Bayern the needed competition this season. Bayer 04 Leverkusen is topping the league with VfB Stuttgart in second position. Thomas Tuchel's side is in third position with 17 points, two points below the current league leaders.