If Sun dumped all of his stake on the market, the price would of course tank, which is precisely why it would also recover fast. The massive stake would be scooped up for next to nothing in no time. After ending up with new owners, the tokens would be distributed in a much more decentralized manner. The chain would be stronger for it. The community is where the real value lies: the people and all their relationships. Nothing can destroy it. The chain id is completely irrelevant.