[jaytaylor]

Underscores aren't technically valid in URLs or domain names ;D

That minor implementation detail aside... You make a good point. Perhaps MD5 or SHA256 hashes will become a last resort for domain names? Haha, no.

[wtetzner]

Or maybe UUIDs...and the typical printed representation of those uses hyphens, which are valid in domain names ;)

[RealStickman_]

DNSv6 will emerge and replace the old DNS system