This isn't a replacement of existing DNS with some arbitrary JSON protocol, this is a P2P DNS called Namecoin which happens to use JSON. Arguably, the flexibility offered by JSON can allow for sophisticated technologies to emerge which can take advantage of this naming system.

It's clear from the very article of this submission that this is the case. For instance, the I2P fields are combined in a structure that best represents the resource on the I2P network. A different structure is necessary to represent a Tor or freenet resource identifier.

If Internet naming is going to be fragmented, I'd rather it not be wasted on Alternative DNS roots, which fall privy to the same fundamental problems as our current domain name system. A Namecoin system cannot be so easily censored.