It would be foolish to look at the sales figures of the M and conclude the market isn't interested in this class of camera. Canon was the last one to market and introduced an inferior product with no lens selection.
Don't get me wrong. I'm not saying the M takes bad photos. I'm saying it isn't competitive in terms of AF performance, features or lens selection with micro 4/3, NEX, or Fuji's new mirrorless system. Why would any informed person buy it at full price?
I really agree with this outlook...I understand that the M is built well and that the IQ is great...but the real deal breaker for me is that there is no VF available for it. ALL of the competition has that covered and Canon showed up last to the party with no VF and slower AF??? I realize that everyone does not feel as I do...but I can not get serious about creating images while making monkey shines behind a screen I can't really see very well in daylight at all...so I would not pay 99 cents for a camera that I would not use.
I own a 5DIII full kit and I could never consider this as back up (but that doesn't make me "right"...it's just my outlook). I have an Olympus OMD and 10 lenses which give me a full micro kit which I just love to use when I don't want or need to carry the big guns. Lots of decently fast primes and a joy to use!