I already said this before, but i really think that the chances of Borussia Dortmund to become Bundesliga champions this year were extremely high and i don't think that they will get such a big chance again in the next 5 years or so. As you already said, Bayern Munich is by far the strongest team of the Bundesliga and if they are able to at least reach like 85% of their maximum performance level, then they will win the Bundesliga no matter what the other clubs are doing. This year this was not the case and still Dortmund was not able to profit from that. Now Bayern should be alarmed again and take the next season more serious.
Borussia Dortmund came really close this season in the race for the title, they pushed Bayern Munich until the end and didn't bow down easily. They might not be champions but I commend their efforts, performance and good mentality. If they can do the same next season, with a little luck they might get a chance to win the league.
Dortmund only had chance to meet and compete with Bayern Munich because Bayern Munich was not in a good form', if Bayern Munich was sound like the way they used to be normally I don't think Dortmund will have they opportunity they had. Honestly Dortmund missed a big opportunity to get the championship, this can take they a long time for them to come across another opportunity because Bayern Munich is a strong team and I doubt if Bayern Munich will be this poor in performance in next season. If this competition of this season can make Dortmund to pick challenge in doing better for next season it will definitely be a great one.