Yes, I believe Tuchel was hastily removed as he would have been given more time to make things better in his own way.
Tuchel was removed because he was a remnant from the past owner of Chelsea. The new owner needed someone who he could believe in as the right choice, but clearly he has made a mistake with Graham Potter. Bad thing is that Chelsea gave him a five year contract and to let him go now will mean them paying him off hugely since they are the ones breaching the contract. They have spent a lot this season and know that letting Graham Potter go will cost them more money, so perhaps the best choice for the business is to give him some more time maybe till next season.
Now we all can say that it is a mistake made by Chelsea's owner in choosing Potter, but we all also forget that it is not easy to manage a team for a coach who come in the middle of a season.
I would prefer to say that the mistake is the decision to change the coach when the season is running a half, I do even doubt that a better or more experienced coach will be able to do better than Potter for this situation.
Of course the best thing is to give him at least a whole season to prove that he is a capable coach who can bring a better achievement.
I think Potter will need to rebuild the team first in the next new season if he wont be sacked at the end of this season.
Potter is a disappointment to Chelsea,ever since he came in,he has being having difficulties to win matches which was why Tuchel was sacked. I don't know what his football strategy is,he needs to change his game pattern. Chelsea has all the players to win two straight matches but look at them struggling to win just one match. Potter should be sacked,there are good coaches out there that can reform the team. Newcastle did great and I wasn't surprise with the result because we all know that Tottenham is in the better side of winning the game,since Chelsea is not in form.