Well, I don't know if many of the statements in that letter are very true. Many of them are based on speculation. I can refute that point about rangefinders becoming dinosaurs almost immediately: I'm 21, I've never even held a rangefinder in my life (much less a Leica) and I am now an owner of an M8. Every single friend of mine that I show it to (also in their early 20s) is considering getting rid of their huge SLRs and buying a rangefinder. Rangefinders have their own niche, the one that they've filled for the last 60 years. That niche, as far as I can tell, isn't going anywhere. If you want proof, search flickr for "street photgraphy".
EVF screens? Why? People have been capturing monumental photographs with manual focus, optical viewfinders for years! Why does an EVF need to be added to something that's already, for its use, pretty exceptional? I can understand that it could make framing more accurate, allow more information on the screen. However, this seems to come with too many compromises; then the idea of shooting a simplistic, minimal camera evaporates, which is one of the most pleasing aspects of using M8 and M9. Even being a child of the digital age, I don't believe an EVF is 'necessary'. There's something much different between looking at a screen and an actual scene through a lens. He covers his argument pretty well though by allowing that it should be optional and detachable. That, in my opinion, is a very good solution for both camps.
I respect that Michael wishes to help Leica improve their cameras. After all, without innovation, how could I be typing this message? So indeed, maybe some changes are in store for Leica, but maybe not such drastic ones. I like his comments on ergonomics *nudge nudge*.
-H