Too true.
Computers won't "solve" social/political/cultural issues. They're reflections of the creators' politics. Even blockchains that purport to be egalitarian reflect the political ideology of their creators -- often naive at best or tyrannical themselves at worst.
If a blockchain became the norm, there would be no way for the state to have more compute power than the rest of the population
There is no way the government has enough servers and computers to come even close to 51% of the world's compute. And if they tried to print money and buy it all, it would be seen as ridiculous and the government would be sacked.
Also, surveilling TOR exit nodes is very different from owning over 51% of all TOR relays. The former won't help you deanonymize users, the latter most definitely will
The allure of a supranational DHT network is that it is more censorship-resistant, requiring deep packet inspection or attacks to block certain lookups.
I think this hypothetical consensus-based DNS blockchain sounds nice at first glance, but really, it just means that DNS is changed from an authority-based model to a consensus-based one. But consensus of what? It's not of people, but of resources -- compute power -- which states will always have more of, anyway. Like TOR, it just means the state has to control/surveil more "trusted" nodes. So it doesn't really solve anything.
You can't "web of trust" a global network of 8 billion people who don't have any interest in this stuff, don't want to peg their individual identities to some online system, and don't agree on what truth is to begin with. You can't techno-topia your way out of the cultural differences inherent in geopolitical disagreements.