Tbh, I'm not sure splitting into 2 entirely separate ranked modes would really be feasible, considering it'll take a lot of dev time and I don't know whether we have enough human players to make waiting times acceptable. Also I'm not too sure about possible bot detection systems, and how fool proof they would be.
But I'm voting for, just to get a message out to the devs that something needs to happen and that it's not just a minority who isn't happy with the way things are right now.
If there are not enough human players one could reduce the number of leagues (until the player base grows), so that the pools of possible opponents would get bigger again.
In addition, as @bronko wrote, the rewards would be higher (if the rewards pool would be distributed on fewer players). so that more people would switch to the human ranked play.