Deep thinking about this problem, the biggest disadvantage is the strongest bitcoin. Bitcoin was born with maximum objectives is decentralization. Because it is not belong to anyone. No one can decide on its price. So if everyone in the world uses it. Can you imagine how much bitcoin is price? According to channel statistics: https://congdongbitcoin.vn/threads/ca-the-gioi-noi-ve-blockchain-nhung-it-ai-su-dung-no.135/ The current use rate is about 0.027 percent. Provisional with current price of BTC is 8900 dollar and 100% people use BTC
                                                                = 100/0.027*8900 = 32962962.96 dollar.
 If price of bitcoin much that. I think that everybody will sell all bitcoin them have. And lastly, no one is keeping a bitcoin, no one using bitcoin, or rather bitcoin can not be reasonably priced.