I think this is the best step by having a new manager for Chelsea at the start of the season and it also seems that Pochettino may need time to be able to revive Chelsea next season to become a club that is respected by other clubs, Chelsea's rise from adversity depends on how Pochettino chooses players in the team squad Chelsea.
I would say that only changing the coach cannot be a solution. The coach should be allowed to work independently. And at the same time, the coach should be given the opportunity to form the team according to his choice. For this Chelsea management should prepare big funds and get the required talented players in the team. While Chelsea's squad is strong, the bonding between their players is very weak. Although the coach has changed several times, the bond between the players has not strengthened. So Chelsea's performance was poor. This is why Chelsea should look for new players.
I think allowing the coach to work according to his own decisions without any distraction will also transform the team very well just as we can see in other top club, this is one of the challenge previous coaches experienced and no doubt it affected the club performance badly.
If Chelsea management can do things rightly the way it is suppose to be done, I don't think the team will be repeating the same bad experience in the next season. Chelsea working with coach like Pochettino I hope things will not be the same like before.
If Chelsea management does not allow the coach to work independently, we cannot expect a good performance from this team. And at the same time, Chelsea's squad needs a change of players. They have been playing together for a long time, but the understanding between the players has not improved. And if the same players stay next season, Chelsea's performance will not be much better. Chelsea management has appointed a new coach. Now they have to spend a lot of money to build the team. If they don't spend money then their performance will be erratic next season too.