I think if you're proposing something as a "good alternative", then being able to understand why it got near-zero adoption, and failed in the real world, is probably important.
I would say that Namecoin appears to solve a problem that nobody actually has in practice.
I know advocates are pushing Ethereum Name Service, which does the same thing - but again, what are the lessons learned from nobody bothering with Namecoin?
(Namecoin is interesting, as it was literally the first altcoin. It hadn't occurred to anyone to fork the Bitcoin code and make their own coin until then.)
I remember seeing work on using magnet links for decentralised sites about a decade ago. I think the "kio-magnet" project in KDE was along these lines, but ironically the blog posts detailing it seem to 404 now ;)
There are "youtube competitors" that offload the high bandwith requirements via webtorrents running in javascript.
You can not host your full webpage with it but you can reduce bandwith costs drastically.
A good alternative to DNS is namecoin. It already works flawlessly and I honestly wonder why it has not been adopted more widely.