http://en.wikipedia.org/wiki/GOMTV_Global_Starcraft_II_LeagueYet never Protoss. It's almost as if the same trend continues since BW.
Ironic, Zerg won the first 2 GSL and still complained about being UP.
Everything the OP said is true though. Granted Terran was grossly OP Aug 2010-March 2011, since then all Zerg baby.
Even in SC lore, Protoss gets the short stick.
The Terran race (mostly the Dominion) controls most of the planets in the Koprulu Sector.
The Zerg get to kill everything once in a while just for giggles and also got to screw the protoss on Aiur.
The Khalai Protoss all got kicked off their planet of Aiur and are now forced to bunk with their Nerazim buddies who they exiled waaay back on Shakuras.