It still matters, let's see what happens in the next five games and then compare...
But they will meet Augsburg, Leipzig, Mainz, Freiburg...and Munchen.
The only level I believe Dortmund are not going to fall is their relegation but anything outside that they don't have a limitation, so actually I think they will fall a little more because of what they have to faced, so the few matches you said is what will justify it. Augsburg which is led by Jess Thorup can make his team to resist Borussia Dortmund since the both has the same to loss, however is a club with higher prestige Augsburg usually knell down, though they have not done it to Leverkusen but Borussia M'gladbach got it two match ago from Augsburg 3:0. However I have Freiburg on mind to also win Borussia Dortmund along the way.
At its worst, Borussia Dortmund would not be in the relegation zone because they have quality players, their initial decline was due to the coach. However, after the old coach was fired and Dortmund management appointed Niko Kovač as coach, hope for a revival emerged. Even Dortmund's current performance has started to improve and is currently in 10th place in the standings and only 6 points away from the top four, Mainz 05.
So rather than saying Dortmund will enter the relegation zone, I would say that Dortmund's chances of finishing in the top four are still wide open. I am sure Niko Kovač can bring Dortmund back to being a team that opponents fear, the next match is against Augsburg. Statistically and in terms of team quality, Dortmund is superior in this match, especially playing in front of their own supporters, of course this will be a strength for Dortmund to be able to win. In addition, Dortmund needs a win in this match to be capital against Lille in the second leg later in the Champions League.