It is simply a matter of time before this 'attack' is defeated for the cause of "fairer" distribution in the block rewards.

YACoin has always been going through a process of weeding out the people who are just vested in a coin for short-term profits over long-term purpose. I'd say the people sticking with it at this point are very high-quality in many ways.

This person (or group) is really hurting himself the most if you consider lost opportunity. As the price drops--as it should as long this attack continues--the magnitude of earnings and opportunities for people who are in it for the long-haul will just be that much greater. The 'fixes' will hopefully be released soon, but time is on our side no matter what.