One point to look at is the demographic of the UFC. It's an American based organization, but a globalized sport. That's why there are tons of wrestlers. The current talent pool are division one wrestlers transitioning into MMA.
Cage Rage - I can't remember seeing too many wrestlers.
Pride or Dream - Tons of Japanese fighters some with wrestling background.
Jungle Fights - Pretty much all Brazillian cards.
TKO - mostly striking
At this point all fighters including current champions understand the importantance of learning grappling techniques. It's great to see that they're capable of winning without specializing in it though.
The Iceman laid out the blueprint not long ago.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.