If you can't convert your Bitcoin and other crypto to your local currency, 1 BTC will still be 1 BTC, but the use case will reduce, and not everyone will want to accept something they can't convert to their local currency as a means of payment. Even buying stocks and investing in real estate won't be a real alternative since you can't exchange stocks or a landed property for food.
But if you really don't trust small- to mid-size US banks enough to keep your money in there i don't blame you as Trump safeguard regulations from keeping this from happening. Banks need more effective regulations, not less. And funny thing that these crypto magazines that hate banking secotr forget to tell you that those failed banks had significant exposure to cryptocurrencies.
But if you distrust the whole banking sector, i am not sure why would you keep trust on dollar itself either and not just keep everything in gold and bitcoin/altcoins instead.