I disagree with your opinion.
Blockchain technology is perfect for this purpose as it provides a maximum transparent and secure way to resolve the issues discussed.
As a user you do not have to download the whole blockchain (which is also no big mess for a blockchain containing the DNS system of Tor; it's mainly static data); you can work with a pruned blockchain or use a web based service.
Setting up a tiny fee on each DNS modification prevents massive abuse as no-one likes to burn money. That's perfect for an anonymous network like Tor.
A public blockchain explorer containing all confirmed blockchain operations is like a public dictionary offering a level of trust for every user.
Tor is only missing an interface providing direct access to the public DNS data of Namecoin or 611 so that it's not necessary to poll external DNS servers (which can be subject to external influence) to resolve domain names stored in the blockchain.
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