I mean, that is fine and all, but it doesn't really matter for making the software run correctly on systems that currently exist.
It's just that those executables are going to have to resolve names all by themselves. Chances are they aren't going to do it exactly like glibc does. That may or may not be a problem.
I'm curious. Why isn't getaddrinfo implemented in a similar manner to the loaders that graphics APIs use? Shouldn't that functionality be the responsibility of whatever resolver has been installed?
The only point I'm making is: Linux does not require glibc.
Users and their programs usually do require glibc but that's their choice. It's not mandated. People could theoretically rewrite the entire Linux user space in pure freestanding Rust if they wanted to.
Name Service Switch is just a solution to a problem. There's no law that says Linux systems must have that system. Programs that depend on it will break if it's not there but that's not the fault of Linux.