We need a DOA that can swap to fiat, that can't be shut down, so we'll be able to continue to trade until fiat is gone.
I can see governments cracking down by closing doors to society, making the million dollars in BTC you have useless for the necessities to get by.
It doesn't matter if I have a Canadian $100 bill in the southern U.S. I still can't use it to buy milk or meat. Crypto will be the same unless we build our own back door they can't close.
Once they implement their own version of blockchain they can dictate the types of payments merchants can accept and penalize those who accept unauthorized currencies.
Business will revolt by skirting the system and there will be the Nation Market and the Free Market until The Nation Market burns through all it's resources and crumbles under the weight of it's own bloated corpse.