> as more people accept crypto for goods and services This is not happening. It's been more than a decade now. I could also argue that the reason the few cases

> as more people accept crypto for goods and services This is not happening. It's been more than a decade now. I could also argue that the reason the few cases where you can actually spend cryptocurrencies have remained is simply that the volume is too small for the authorities to care, especially since they can just start regulating once it matters. You're not addressing OP's point that in the end, you want to spend the currency within the legal system if you want to buy something other than cryptokitties. Or to go back to the main topic, you have to go back into the legal system if you want to buy shares. If the authorities declares that you have to buy your shares with USD, then you have to buy your shares with USD.