No one owns the bracket. Not P2Ps, not F2Ps. Blizzard owns it. That being said, I agree if the F2P crowd, including the Brazilians, suddenly vanished, the bracket would be deader than a doornail. However the same wouldn't be said if the P2P left. I'd say we all have a symbiotic relationship. F2P keeps the ship sailing by being the rowmen, while P2P's pay the repairmen (Blizz) to keep the boat(WoW) from going under. What we lack in money, we bring in numbers, and what the 24's lack in numbers, they make up for in money.
That aside, just all of 5.4 Grinds my gears. This is probably the most unbalanced bracket hands down at the moment.