It's hard to expect Lampard to make big changes to the Chelsea squad in such a short of time, his experience as a coach at Chelsea before as well as Everton shows what he really is, he still needs time before he becomes a great coach, and actually coaching teams in other divisions will it is better for him to gain a lot of experience like Vincent Kompany did.
He was managed Derby County, but he doesn't make any change. Without any achievement, then he managed Chelsea, nothing change again. He managed Everton, still nothing change.
Lampard is only have a privilege since he was a veteran player in Chelsea, that's make people respect him and he already have a good relationship with Chelsea, but as a coach he's absolutely bad and nothing we can expect about him.
Lampard is only good to become a temporary manager, if Chelsea already find a good manager, he can become an interim manager or just kick him out.