Oh, and of course perhaps the most obvious one. Even if for whatever weird reason we as a society decided to start using cryptocurrency as widely used payment method, why on earth we would be willing to make that huge transfer of wealth to a few cryptonerds instead of forking our own and sharing the coins somehow more equally? It's not like creating your own cryptocurrency is that hard...
Creating one may not be hard, but having it be used/accepted will be. If you look down CoinMarketCap you’ll see hundreds of “currencies” that are either illiquid or nearly worthless.
