The situation with Potter had become unsustainable and everyone was mad about it, the fans did not liked Potter probably since the very beginning and the lack of results made this even worse, the players were skeptical and finally even the people at the top at Chelsea had to give in, and while late they had no other option, however this will make even harder to achieve victory on the Chelsea they will sustain with Real Madrid next week.
I think Chelsea's chances will change after Chelsea sacked Graham Potter recently. Chelsea's game today was good against Liverpool, but they are still struggling to score goals. If the interim coach is able to find a solution to this shortcoming, it is not impossible that Real Madrid can be beaten. The team's confidence has improved as seen today, but some adjustments are expected.