[earthrise]

I haven't read the paper, and I'm certainly no expert in game theory, but I don't think we have to worry too much about this. The assumption seems to be that selfish miners will collude to control the network. However, it still seems to be in their best interest to compete. If the coin starts losing real-world value due to a bad controlling group, rational miners will stop helping the controlling group mine.

In addition to spending time/money/resources on mining hardware and power, miners now have to spend time/money/resources on finding and implementing better strategies. This just shows that there's another variable.

(I could be, and probably am, wrong.)