While I understand Phase One's somewhat generic response to not "support competitors" as perhaps a business decision, in practice it is not the most compelling, imho.
Phase One is really in two separate fields: medium format camera systems and raw image processing software. You can look at them as combined entities, but I don't. Basically every camera manufacturer includes some sort of processing software for its cameras. But for the most part they are either weak, very basic and/or lack some real functionality or capabilities desired by users (e.g., tethering).
No one runs to use any of these "lesser" processing solutions offered by manufacturers. Phase One touts Capture One Pro as a leading processing software solution, and for good reason. It does solicit its software as a better raw processing solution for other camera systems. The other major alternatives being offered through Lightroom and Adobe.
Sometimes when I hear people exclaim that MFDB users need to adopt some alien processing workflow, I laugh. I use essentially the same workflow for all my camera systems, and enjoy all the tools of the same processor with C1Pro. [/I]And that's the real joy in workflow and and ease in using (and enjoying) different cameras and systems. Using the same C1Pro software/workflow makes it easy.
Certainly the raw processing partnership with Sony couldn't have been a bad thing. Taking another bite (and profit) from competitors in the medium format realm might not be a bad thing.
Ken