I totally disagree with your assertion of Borussia Dortmund ever dominating the Bundesliga. It's only twice in the entire history of Bundesliga that Dortmund has ever successful defended the title that they won. Dortmund has a total of just 8 league titles even FC Koln has more league titles than Dortmund (9). Bayern has a total of 34 league titles. So I'm just wondering where and when Dortmund dominated the Bundesliga.
What is called dominance, as demonstrated by Bayern Munich, is that they managed to maintain their existence for almost several consecutive seasons over a long period, and no other team in the Bundesliga was even able to dominate them. Dortmund doesn't have the ability to match Bayern Munich's capabilities because they always try to sell every player who develops at the club, so all they think about is business. For this season, I doubt Dortmund can compete with Bayern Munich because overall, there are no changes they have made.