Sacking the manager is pointless unless you have someone you think can come in and make both an immediate impact, but also keep the team on an upward trajectory in the long term. EtH did that when he arrived, and it's really hard to judge at the moment because of how many injuries and off field issues there are.
Eventually we'll get players back and performances will improve, but we'll be lucky if it's in time to finish comfortably in the top 4. The team still lacks depth in certain areas, especially attack. People can keep going on about how much money he's spent, but in context it's still not enough. Chelsea's two CMs cost over £200m. The manager should get to the end of the season, and if they replace him then it should be somebody who can work with these players and also with some kind of long term strategy in place.
That's what Brighton had, and it's why they transitioned so seamlessly from Potter to De Zerbi.