It has not been forgotten about. Just because some owns a device and something is thought of as odd, strange or unbelivable, does not warrant that device to be immediately in the spotlight.
If one pays attention to the releases of Steinberg software (which, after using Steinberg stuff for almost 30 years, is hard not to it’s evident that the software teams are relatively small and that products are mostly being worked on in turn. Anything CC121 deemed (by Steinberg/Yamaha) necessary to be worked on, certainly will be and eventually released.
Oh BTW, in my opinion the CC121 is a very unique, one-of-its-kind sort of a device, that makes life so much easier and the desk less cluttered. I even think it’s making me permanently ambidextrous… Outstanding left hand device!!!