RLC's home page is getting crowded now. They couldn't grow to fit in another couple without requiring a new home page redesign.
Maybe another couple will leave, maybe they'll lock or open cams, maybe since they added a new time-zone they might find a couple in Australia as well and go truly global. Or maybe not.
I don't know what their strategy is, but I'm 100% certain that they'll been monitoring their ratings on Alexa and the amount of new paid memberships closely. After all is said and done, RLC is a business. Of that, we CC fans can be assured.