Chelsea has now three opportunities to play against teams that are not in top shape in the Premier League. Perhaps this win against Dortmund now gives them a push and they can improve. If they started a winning streak now of three consecutive games, they would afterwards host the game against Liverpool and that could be their final chance to keep a realistic probability for the qualification for the international ranks in the table. I doubt that they can still make it 1-4, but if they win a lot of games the Europa League could still be achievable.
Based on what Chelsea displayed in their home to defeated Dortmund 2 -0 showed that there is a hope for them to win their next match to encourage their fans that they can still make it in this season. I don't think, what Manchester united experienced from Liverpool few days ago will happen to Chelsea, because they will never allow Liverpool to score more than two goals before the end of the match. If Chelsea can do what they did in Europa league competition to defeated their opponent, and apply the same strategies in the premier league competition, I think it will help them to recover from their losses.