will there ever be a ranked system for BO2 ? like maybe a certain server list of matches that hold ranks when you play them ?
You can try checking them out since that seems to be similar to what you are looking for.
In terms of Plutonium hosting ranked servers, while possible, is unlikely due to us not really having the manpower to manage servers, and develop the client.
Currently server owners can do quite a bit in terms of creating a ranked system for their own servers, and many have done so.