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.
During the time when they sacked Thomas Tuchel, I did say that they will definitely feel the heat and regret on that decision as time goes on and now it already happening.
Potter poor performance now has become worst than Thomas Tuchel poor performance time that lead to his sudden sack.
Chelsea is a big team for Potter to handle and with time if things continue this way, I do think at some point the owner would be left with no option than to sack him. Chelsea couldn't even get a single goal during their match with Tottenham.
I think there is a contract that is signed when a manager is higher to coach a team or club, and the management has the right to decide what they feel is good for the team in their own way, and sacking Tuchel isn't something I took personally even though I condemn the imminent action from Chelsea, however, their choice of Manager with Potter is actually bad despite the hype of new players they break banks and bought, still they are underperforming. Potter has been doing well in other teams way before he came to Chelsea, the performance here is something I can't say a thing about, it is just so poor at this point.