I guess you mean GM, as CMs (community managers) do still exist. There's even been a recent addition to the CM team: Skerio.
So, if you are referring to GMs (Gamemasters), they became no longer necessary since 2010 as CifSoft CipSoft rule enforcement tools rendered them somehow redundant. They turned into senators and senior tutors, roles which do not encompass the same degree of responsibility or power.