Each OS release, we should update the locale.alias, locale.dir files to match what glibc provides. This can probably be scripted entirely, or can be scripted with minor human editing afterward. Highlights of a discussion with Ulrich Drepper about this request will follow in the next comment. This should also be added to a per-OS-release X releng document and stored on the wiki, to be used to populate per-OS-release/milestone bug trackers during development cycles. Filing this in bugzilla to ensure it does not get lost.
This issue will likely always be a low priority that gets out-bid by higher priority video driver bugs, X server bugs, etc. In reality, the number of locale related bug reports or feature requests we get per OS release is pretty low, usually zero. This is probably something that makes more sense to have done upstream than at the OS distribution level. Due to the low priority, and low real-world gain, I'm closing this as WONTFIX, as there's not a lot of justification to allocate resources to this.