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.