Of course ghash.io would do something about it. Like any mining pool would want to bring down the network, their source of massive income ........
Still we couldn't just count on the good will of the mega pool like we did every time in the past(Deepbit, BTC Guild...), it's intriguing why miners keep flocking to the biggest pool and whether something could be done about it.
Do we know how much hash power is from CEX.io mining contracts (which go through ghash.io) vs independent miners?