I'm just looking at Bayern Leverkusen in a certain way especially after the departure of Xabi Alonso and some key players in the squad who at least I would have thought they stood a chance to give some certain level of resistance to Bayern Munich this season. With Ten Hang I really don't see that, as for Dortmund, those guys can never be relied on because they disappoint when it matters most.
The Germany league is not for the weak, only the strong do survives. Borrusia Dortmund have been dormant for several season, they involved themselves with the business of serving important goals like the triggering of the sell clause and buy clause of players in the transfer window. Bayer Leverkusen will bounce back to epic form, its just a matter of time before winning sets in. Everyone underrate Erik Ten Hag when it comes to the managerial positions with dealing with Bayer Leverkusen. He's showing absolutely zero odds to boost the club's performance back to the top. Give Erik Ten Hag time, he will succeed.
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.