I don't think Pochettino's stay at Chelsea has been something to say the club have improved because if you say he should stay I think this guy will only handle Chelsea like he did with Tottenham without any trophy and you'd agree with me that the fans and equally the board don't have that time to wait, we know how desperate they are especially the fans.
For me i would say pochettino has really try very well in his own little way, it has really been a hectic season for chelsea this season and the last one, but somehow pochettino has managed to place them in the 5th position. That's really progress for me. Pochettino leaving the club now wouldn't be adviceable, because i see great potential and efforts in him this coming season. He should also use good of the transfer window.