[kelnos]

> There is no entity that can prevent you from using it.

As long as you still need fiat currency to buy regular goods -- or pay taxes -- entities can make it difficult for you to use cryptocurrencies. If you have to convert cryptocurrencies into something real-world in order to live, governments can make that difficult for you.

I am just not convinced that we will get to a place where you can live solely (or nearly solely) in a cryptocurrency world, without needing fiat.