Image quality may be superb, ergonomics sublime, size and weight unobtrusive, but I would never buy a camera with a fixed focal length and no way to change lenses. Who shoots at 28mm exclusively? Even a 3x zoom (28-84mm) would increase its usability a million-fold. Why waste all those development resources on a camera that is so restricted in its usability.
As you might guess, I was not brought up in the Leica rangefinder school of street photography. I started with 35mm and a couple of zooms, so I've never been restricted in focal length.