I prefer to think of this as a feature, not a bug, because it incentivizes vested parties to keep PoW-mining power parity with each other. Successful execution

I prefer to think of this as a feature, not a bug, because it incentivizes vested parties to keep PoW-mining power parity with each other. Successful execution of a 51% attack shows that there's not sufficient volume and diversity of vested parties, and the dominant party is adversarial and can't be trusted to refrain from manipulating the chain.