Where would you go? The EU and Japan are already in a worse position than the US and if the US decides to commit to capital controls, they would probably follow. That only leaves China which already has capital controls.
There are 195 different nations on earth. That leaves a lot more options than the EU, Japan, and China.
A lot of crypto-expats are going to carribean island nations.
Are they going to buy Lamborghinis in pesos? More seriously, yes, some people are content with living like a rich native in the global south but for anyone else who plans to participate in the global economy (and I assume they do, because capital controls would likely only affect high net worth individuals), they would need to convert to EUR/JPY/CNY/USD.
No.