Description of problem: When running Rawhide I want to be able to do things like # yum --disablerepo="*" --enablerepo=fedora install foo to install things from the last stable release. But this fails since fedora.repo uses $releasevar. Instead fedora.repo (and updates, updates-testing too) should point to the last stable release. Because right now on Rawhide fedora.repo is close to useless. Thanks for considering.
That would require modifying the file each and every release, and making it harder for people to make adjustments to the repo files that carry over to the next release should they upgrade. Perhaps what would be better is a way to override $releasevar at yum envocation time. I'm closing this as WONTFIX.