Focusing on the Champions League too much and having problems in the Bundesliga on one hand isn't very ideal for Dortmund at all. Dortmund's main target must always be to finish the season in top 4 at worst. Because the Champions League is like a tradition for Dortmund as they can normally finish the season in this area easily.
But right now things are going really badly for them about this topic. While Stuttgart and Leipzig are performing much better Dortmund will need to work much harder than this. As there is a long time to go for next round games in the Champions League Dortmund had better work on their weaknesses in the Bundesliga.
This season, Dortmund did not have a clear direction. They are inconsistent even against small teams; the last two matches they drew should have been won because they are better than these teams, but they are out of form this season, which I blame on the management because they used to sell out their important players every season for money even if they did not get a direct replacement.
If Dortmund does not sign more players to strengthen their squad in the upcoming January transfer window, they will continue to fall because Stuttgart and Leipzig are unwilling to drop points as well, while Leverkusen is challenging Bayern for the title.