Why do you think that Dortmund has not that chance again to win the German League Title next year.
They getting better and better and every year they getting closer to Bayern Munich, and with Leipzig and Union Berlin there are now 2 more Teams for fight the Title.
Bayern Munich caused the problem themselves with kicking there coach out in an important time they have got a lot of important games.
Of course Borussia Dortmund has the chance again next year again to become Bundesliga Champion, just like every other team of the league has the chance to win it. It is also obvious that for at least 15 teams those chances are only of theoretical nature and i also think that in the next years it will be harder for Dortmund to get a really good chance to win the title. This year Bayern Munich did not play well at all over a pretty long period of time. This happens maybe twice in every ten years so i doubt that this will happen again in the next season.
And the truth is that if Bayern is delivering, then there is nothing that Dortmund or any other club could do to become Bundesliga Champion because Bayern is simply to strong.
I also don't think that Dortmund comes closer and closer in the last few years. Looking at the squads. Bayern is probably more far away in terms of overall quality that they ever were in the last 10 years. Now that Bellingham is gone, there is probably not a single player of Dortmunds squad, that would make it into the starting eleven of Bayern.