That's for sure, that if half of the Bitcoin will be accumulated by only one entity be it China, other country or organization then they can easily manipulate the price fluctuations of it. Since they have the most liquidity, once they sell in large amount then price also will fall a lot. Same in on buying aspect where price could trade up higher easily by their own manipulation in price and supply. However that's not even true yet. Most BTC are in cold wallets and others were missing. That's why BTC is a great digital asset as how also complicated it is.