Yeah, the NW pilots' CBA prohibits the company from selling CPS until they add 10 new narrowbody airframes to mainline above the floor that was set when we got our 18th E175 (a few weeks ago). With no narrowbodies on order and the C-series not out for 5 yrs or so, I think it'll be some time before they can sell Compass.
Unless, of course, that language goes away when they negotiate a joint DL/NW contract.
Personally I think we'll be inundated by NW flowdowns long before we're sold.