Earlier quoted context omitted.
I think it could slow adoption, but I've been primarily buying offline. Soon I'll have a lightning node too--improving my BTC privacy. Defi exchanges are the next major advancement to government resistance as well. This space would rapidly mature under government regulating away self custody.
If all of that ends up working out, and considering no other restrictions are put in place: How are people going to pay their taxes? Being the exclusive currency accepted for tax payment is an important part of what makes fiat currencies money.
The government is going to have to suck it up and accept taxes in cryptocurrency. In my country such laws have already been proposed.