Sure, they can do that, but the damage will already be done.
* Currently only 10 major pools to choose from.*
The Powers that could collude 4, could collude all 10.
Two colluding partners is difficult to maintain (since either partner can gain an advantage by first agreeing to collude and then operating outside the collusion).
More colluding partners is even more difficult to maintain. There is more opportunity for a partner to operate outside the collusion, and more opportunity for the secret to leak.
Even if you could get 10 pools to collude without cheating on each other, there's nothing stopping me or anyone else from starting up another pool.
The troll discounts the fact that miners/pools/ASIC-producers have a direct long term incentive for the success of the network.
Plus if they were truly colluded, the troll discounts the fact the Bitcoins is composed of people, who can be in consensus to fork the network away from anyone who tries to co-opt the network.
Dumb asses such as Windfury, totally fail to understand the damage a short term 51% attack would have on bitcoin,
Loss of confidence would crash the price and destroy profitability of the miners.
No Profit, No Miners, No Bitcoin.
* The only reason some bitcoin miners are surviving now is because of moron venture capitalists,
that keep throwing money at them, that way they hold the majority of newly mined bitcoins off the market. *
But even Moron VCs will eventually run out of money and that will force the miners to unload their bitcoins and crash the markets.
WindFury has proven to be one of the last batch of Greater Fools, new ones are few and too poor to make a difference.