I think I said this before, but they didn't lose the title in the last match at home, they lost the title in a dozen of matches they should have won or tied before the last match was played. Dortmund is just not good enough and it has been like that for a while now. They have good weeks and then it looks as if they were able to break Bayern's dominance, but then the disappointment is so huge that nobody can trust their eyes what's happening. The last game last season was only the tip of the iceberg. The whole drama enfolded over the course of the whole season.
The present poor performance from the Borrusia Dortmund, they deserved it because they derived more pleasure and making enormous profits from selling their key players other than aiming to winning major titles. Last season would have become one of the good moments that would come from the players and the team's supporters, but the team choose to ruined it by losing their last match that would have settled the difference between them and Bayern Munich who was also the exact same points. Dortmund have to stop selling key players to other elite clubs and decides to stay firm and build their club surround these incredible players.