As I suggested on Reddit:
Wouldn’t it be possible to just pick another name for the user facing
discussion, like “discussion”, “forum”, or “talk” (to throw out a few
possible bikeshed colors) in order to leave the “discuss” redirect
around and not lose a year or so worth of history?
So, I’m all in favor, and discussion.rust-lang.org, forum.rust-lang.org, and talk.rust-lang.org all sound reasonable. Seems like talk is turning out to be the most natural, that several people have suggested or agreed with.
And yeah, keep the name internals for this instance, just have a redirect in place so that the links don’t break.