Yes - In Beaker we have plans for a userland namespace, which will be under the "app://" scheme. And we may someday move from DNS-over-HTTPS to something like DNSSEC, but that's not planned yet.
I'd love to see a kind of reverse-DNS-style tagging system, so that when my browser comes across a dat:// link it can automatically show me that this content is commonly tagged as "book, Fahrenheit 451" or such.