Well if no one will step up and do something we could be in for a rude awakening. Where are the bitcoin pirates with their DDOS botnets to take this pool down a notch 
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.... DDOS attackers are pure scum. Such an attack would cost other bit coin miners lost revenue. Are you going to pay them back?
I see few options if we actually reach 50%+ .... Bitcoins will be worthless if double spending occurs. Network compromised ruins this system.
They would destroy their own company and wealth to do it. Why in the world would they toss away tons of revenue to double spend a few coins?
This is a valid point, but some people destroy simply because they can. Do we have any idea who the actual owners are? From what I have heard no one knows who is pulling the strings, and that is a dangerous game when we give a loaded gun to someone who is anonymous.