There are very strong rumours that Apple will be rebranding OSX to macOS in June 2016.
Interestingly enough, osx already has macos as a synonym (established in 2013). If OSX does get official renamed to macOS, we would want to reverse the synonym direction. That would require a moderator because there are vastly more questions tagged with osx at the moment.
I support the synonymization, but we should wait until the change is official. (It would be pretty awkward to have to undo the link.) If there are strong, credible sources for the rumors, tag wiki edits could be appropriate.