Dortmund fans was and will always large and very loyal to the team even they are playing not so good.
This will be not changing , for sure they are frustrated when they dont win and making good games.
But i guess that Dortmund will be playing in the next Weeks better and better.
Even though their opponents are not playing well, I don't think Dortmund will be able to perform much better in their upcoming match against Freiburg. If the club continues to sell great players without replacing them with anyone who is better, their performance will eventually get worse throughout the season, and Dortmund fans will become upset with the club.
Well that makes a little sense, even though their opponents include a team that is said to be less good and less shining but it could be a threat to Dortmund when we see how the sales habits of the players there. Honestly I can't fully predict how the final result will be, I think well Dortmund have a higher chance of winning but on the other hand they must also be a little difficult to play without maximum performance because some of their important players have left.
I think this problem can not only bother them in the next match against Freiburg, but also in the next match until the season ends, we see Bayern Munich are far above them in the current position and I think this is enough to prove how Dortmund's performance has declined this season, the top position of the standings that they occupied last season has now been replaced by Leverkusen, who can always perform optimally to get full points. So it is true that indirectly this business habit has caused problems in the trophy hunt, I think Dortmund must immediately reduce this habit because they have been absent from the Bundesliga title for quite a long time since the last in 2012. This can be a consideration for them to be able to return to appear consistent until the season ends.