Ultimately I think the only way to stop the constant crashing is if the international buyers find enough interest in bitcoin to buy a large chunk of the coins back from China.
That's assuming that many of the Chinese coins on exchanges are real in the first place.
People have posted they are moving from Bitstamp to Chinese exchanges because of the hack. However, can you trust an exchange if you are not certain if the coins it claims to hold exist? I read that's what Mt Gox did.