I also think Dortmund needs more effort to get the next season's trophy because they usually sell their good players. I don't know why the money or the trophies? Dortmund have been waiting for so long for dortmund to get these trophies, but I think they always misuse them, and that is why Bayern Munich always challenges them when it comes to these competitions because bayern always utilize their star players in order to get these titles. I don't know if Dortmund management is not seeing how it goes to them, but they really need to change how they are selling their star players.
The competition from bayern and dortmund have been also happening in the transfer market too. Just like the last match of the previous season. That proves that if dortmund lack of winning mentality. It's only 1 step ahead to get victory over dortmund in the bundesliga but dortmund was not able making it happen. Dortmund was aware of that, but the problem is you can't always be sure if the players will always show the best performance. The last match against mainz has been showing to us how bad dortmnud at that match as mainz was leading 2-0 before dortmund was making it to be draw.
However, if Dortmund continues this way, I believe Bayern Munich will be leading all the time, and Dortmund will keep waiting until they change or get new players, since they have already sold them out.
I hope the domination will end for bayern. It looks very boring to see bayern to win 11 bundesliga titles in a row without any losses. The only problem if DFL was also preventing the clubs other than dortmund and bayern from growing by cancelling a lot of investments that have been offered by investors.