I agree with what Holy said for the most part, nowadays Kha are just played as fetish characters used in weird ERP scenarios and little outside of that. I think locking them behind a CA will help the Kha community, not destroy it.
I can imagine the reasonining for it is due to inactivity, the way kharajyr are meant to be and how certain players rp them, as stated above. Coming from somebody who practically lead the kharajyr as a spiritual leader for a year or 2, this is the best thing that can happen to them.