then we will have digital currency similar to USDT = 1usd
so basically "fiat" but in your phone
Fiat's only benefit right now is that the government is manipulating it to keep it steady in value. However that manipulation, whether to steady the value of a currency or to make the currency drop in value so that more exports can go abroad isn't going to last long.
Bitcoin's decentralisation is key to economic reform in future, in my opinion.
More people will definitely move to bitcoin in the future when they realise that they don't want to be in the grip of government manipulation.