There was an interesting paper a few years ago about this inevitability; http://iang.org/papers/BitcoinBreachesGreshamsLaw.pdf http://iang.org/papers/BitcoinBr

There was an interesting paper a few years ago about this inevitability; http://iang.org/papers/BitcoinBreachesGreshamsLaw.pdf http://iang.org/papers/BitcoinBreachesGreshamsLaw.pdf Then it was in the context of botnets and chinese miners -- but the theory is that dishonest mining (stolen electricity) will necessarily drive our honest mining which will spell doom for Bitcoin.