BTC is used for bypassing government controls (drugs, money laundering, currency export controls, remittance) There will most likely be demand for that in the future. I'm not saying anyone should invest in crypto, I'm just saying those use cases exist.
I still don't know the value of public, distributed, cryptographic ledgers. They don't seem to solve real-world problems because there is no way to tie them to the real world. They preserve lies just as well as they preserve truths.
Digital money is useful, but fiar is already digital.