I kind of wonder if Phase One saw an opportunity when Apple abandoned Aperture. For me Aperture was, and still is more elegant and intuitive, and even better looking than LR. Like myself, many Aperture users just never felt at home in LR. To me it is ugly, clunky and seems pieced together. Now, do Aperture orphans make up a significant enough market to have inspired PO to expand CO? I don't know. But for me, despite evidence that CO is an evolving app and despite the fact that LR has some distinct advantages (particularly in the printing and proofing department...and the vignette too) I have no intention of going back to LR. I used to enjoy working in Aperture. I used to dread working in LR even after I learned it and developed a work flow. Now, I enjoy post processing again in CO. Maybe some of it is GUI stuff, appearance and other intangibles, I don't know.
Also, I'm an amateur and have low volume, which certainly impacts my outlook compared to a high volume pro who needs extensive cataloging and batch processing features.