I am not saying that Bayern will definitely be the Bundesliga Champion in the next 5 years too. I just think that Borussia Dortmudn will probably not get a chance as big as they had the last season to become Champions themself. I think that in the last season it was not only Bayern Munich that showed very poor performances for their standards but RB Leipzig also. They had a very bad start into the season and even had to change the coach back in september.
So i think that it is very much possible that Dortmund will not become Bundesliga Champion even if Bayern Munich is not winning it, because other clubs like Leizpig and Leverkusen have a squad just as strong as the one of Dortmund in my opinion.
in every season, of course, there are always changes in substitutions that always affect performance in each season. well, this is what gives no guarantees for the future of teams in all leagues and Bayern Munich may not forever dominate the bundesliga but at least a strong effort to maintain the stability of the players to remain the best.
I'm not saying there is no chance for other teams to shift Bayern Munich's position but as we can see, Dortmund last season wasted the opportunity to shift Bayern Munich and this is proof that no one can compete with Munich for the next few seasons. but there is little chance that next season Dortmund will have to compete with other teams to finish runners up in the bundesliga like Leipzig.