You are jumping into conclusions that are simply wrong and mistaking spec identity with class identity.
The part about mages was hyperbolic, the second sentece was not. Long casted and hard hitting Chaos Bolt is a singature of the spec.
Theoretically, you could design an instant cast spell, a 0,5 second cast spell, a 1 sec cast spell and so on, with the same DPCT as CB has. But the fact that its long casted and hard hitting is what make it special.
As I was saying somwhere else, the ideal thing for PvP would be for CB to be a instant cast spell with the exact same DPCT. And while we're at it, lets also make all other spells instant, because thats the best things for Warlocks (not overall) for PvP.
I agree though that CB's damage in PvP should be buffed. It should be a threat. It shouldnt one shot ppl, but it should be punishing enough.
People will always whine when they see one big number, but are unable to comprehend that a large number of smaller hits in a small time windows might be much more devastating.
But the world is ruled by stupid people, so what can you do..