In fact, governments like New York have cracked down on Uber and AirBnb. I do think if BTC or another crypto were to be a problem for a country they would simply legislate away people’s right to hold or exchange it. US would pass a bill that makes the exchanges illegal. Sure, people would find ways around that, but it would be enough to deter your average citizen and to squash widespread adoption.

Whether BTC becomes a problem is a question, but if use in laundering or escaping taxes gets past a certain point, I do think it is a risk.