I think he's a strong believer in Karma now.
He made fun of numerous people for not having the caliber to make it 'big' and a few years later Em, himself, is suffering and his career is down the tubes. He used to make fun of Whitey Ford for being fat and a few years later Em, himself, is obese. He made fun of Ja for being on pills/drugs and a few years later Em, himself...well, you get where I'm going with this.
Just a theory. But it would explain why he hasn't really gone at anyone (excluding Nick and Mariah), at least not to the extent he used to. He just kinda throws out killin' it verses/random disses to no one in particular. What do you guys think?