What are the chances of this being "accepted" and existing? Also further to this how frequently are new HTTP Status Codes proposed like this and what percentag

What are the chances of this being "accepted" and existing? Also further to this how frequently are new HTTP Status Codes proposed like this and what percentage are/aren't "accepted"? Not sure if I should add it to http://httpstatus.es http://httpstatus.es or not (with some sort of "proposed" signal)