bitcoin is not used as a currency, it seems that the influence of total supply is very limited and the price is very expensive so it makes the price of bitcoin very expensive and is not suitable if used as a currency because it will be difficult to use for transactions.
I hope that even bitcoin cannot be used as a currency, we could still use bitcoin to pay or buy some products. Or maybe in that time, we can use another coins that can be a bridge from the currency we already use and the digital coins. I think by using bitcoin as a currency, it will need all approval from all countries and the governments which I think they will not easy to agree for accepting bitcoin.