Barring any compelling arguments to the contrary, in order to ensure players continued ability to play maps that are still considered to be 'balanced' in ranked play, in an upcoming update to the API, map uploaders will no longer have the power to 'unrank' a map after the initial choice to rank or not-rank the map on upload.
Maps can still be uploaded as either ranked or unranked.
Maps can still be unranked on request for any reason that would make it unfit for ranked play, such as balance, functionality, or exploitation reasons.
Maps will still, by default, auto update if a new version is available regardless of the ranked state of the old map, and authors can still hide maps they uploaded at will.
This change will ensure that players continue to have the option to play any map in ranked providing they still have access to it and that said map is still considered balanced and functional going forwards.