Interestingly enough, as the ledgers are all public by nature, there would be nothing stopping states from forking blockchains into centralized solutions, outcompeting miners by reducing transaction costs to zero. Crypto-anarchists would lose their minds, but most consumers would probably pick whatever's cheapest and which "just works".

Don't get me wrong, I love the politics of decentralization. But it's worth remembering that decentralization tends to be a cost-center, not a profit-center, from the standpoint of efficiency and performance; and decentralized tech is no guarantee of decentralized results (see Amazon/Facebook/Google, who have quasi-monopolies in their niches, despite being delivered over open and federated web protocols).