How can people feel short changed by something they haven't bought? I completely understand the desire for better products (although how some people define 'better' seem rather short-sighted), but if something is released that isn't for you, you don't have to buy it. The money we've spent on cameras and lenses in the past was for them alone, it doesn't entitle us to anything in future. If a company moves in a direction we don't like, we don't have to go with them, but stamping our feet and threatening a tantrum (which seems the equivalent of proclaiming 'I'm going to sell all my gear and move to another brand') strikes me as rather immature.
The M2 doesn't impact me one way or the other, so why should I care? If I was in the market for this type of camera, I'd look at what's available now and choose one (and I would advise others to do the same), not wait around for possible future products.
Incidentally, it's not true that only Canon releases new gear that is similar to old lines. It's bewildering how many compact cameras and superzooms come out every few months, whose specifications seem hardly different from the existing ones. And wasn't the D610 essentially identical to the D600, to pick a single example?