That's wrong to say the situation in Chelsea is bad just because of their coach or because of some players in this team. You may remember in the last season they also had a bad performance when they had Potter in the team but it was not working for them and now Chelsea can't get good results with Pochettino while he was not guilty for it.
Pochettino tried to make the team younger and he tried to the best he could to improve Chelsea but he could not get the results they wanted to see and that's why they fired him while Pochettino was not the problem in Chelsea.
One cannot see the performance of Chelsea this season and blame it on the coach that he hasn’t done well this season, he has done better than his predecessors and that’s a big achievement for him and a big achievement to the club as well in all honesty. I still don’t get why Pochettino was sacked all of a sudden, he might have been expecting it before now and the sack must have been part of their agreement if he didn’t fulfil some tasks by end of the season.
His sack was sudden and many Chelsea football fans didn’t expect that to happen to him but it’s all part of the undisclosed agreement with the club. He is a good coach but he might also have some limitations to what he can achieve for the club, if the club doesn’t want that limitations, they will have to sack him and bring someone that can lead the team to their best and to achieve what they want for the club. I think this is the case of Pochettino and he left the position without any more arguments with the management of Chelsea.