@Pixificial
Cheap devices with low specs, and thus developing areas around the world, wouldn't be able to keep up. Centralisation is not inherently bad, and pure peer-to-peer is not inherently good. Generally, federation is the best of both worlds. A single server on a VPS for a single small website is cost effective.
Making DNS lookups purely peer-to-peer is a great idea, though. We ought to support projects like #opennic and break censorship.
@Pixificial
I have heard of YaCy. Search engine decentralisation is a very tricky thing to achieve. I don't know how effective YaCy is.