... But I guess they'll buy an old film MF and digitize it rather than Phase one.
Imagine if they sell it with an adapter that makes you put EF lenses with a crop mode... this will make things easier for users to do the transition, to buy the camera and the MF lenses on stages instead of putting bulk on many lenses when they first purchase the body.
All the present MF manufactures make digital cameras/backs. Bronica and Contax (a good camera in its time) have been out of business for years. This leaves the recently defunct Rollei as the only choice. Sinar and Leaf sold private labeled Rollei Hy6s with their own digital backs. The Rollei used mainly Schneider lenses.
MF cameras are used by Pros who have no interest in using EF lenses in a crop mode, they already have 1Ds III or a D3s/D3x for that. Why would a consumer use a MF camera - they aren't good for sports, BIF/wildlife, family snapshots or vacations. Some serious landscape hobbyists use digital backs on view cameras, so there may be a market there.