Any replacement will need to facilitate existing domains, it could be implemented as an add-on to existing resolvers like bind or dnsmasq.
[1] https://en.wikipedia.org/wiki/Namecoin
I don't think it's a good idea to toss in an ambitious redesign of the internet name system when it's not even clear that we can get everybody to agree to just stare down ICANN.
Any replacement will need to facilitate existing domains, it could be implemented as an add-on to existing resolvers like bind or dnsmasq.
[1] https://en.wikipedia.org/wiki/Namecoin