Chelsea winning trophies will not come as soon as many have expected. Pochettino is building Chelsea from scratch with new players. Much shouldn't be expected from him. It will take years before we can see Chelsea comfortably lift a trophy. The least we can expect them to do at this season and the upcoming season is to fall between the top position of 3rd to 7th position of the premier league table.
Well some managers can pull it off but it is not an easy task to accomplish. There have been a lot of changes done to the team and it’s just as you said, pochettino is building chelsea all over again so we shouldn’t expect much from him this season, he has added a lot of players so if he can work on the team style of play and the formation to adopt this season I think he should be able to fight for a spot in the top 4 because the players have individual qualities. By next season the team have been ready to challenge for the title and not just fight for a spot in the top 4.