I agree with almost everything you say, with two observations to make
I highly doubt any 3rd party company will develop M lenses since this mount is only used by 1 camera so far
Samyang have. As discussed earlier in the thread.
..unlike owners of Fuji or Sony where they would sell all the DSLR gears and move to those CSC cameras and their only camera.
I'm sure cases exist where people have done this, but in my opinion anybody who does this must only have very specific needs that these cameras exactly satisfy. For me a camera system is nothing without a strong system. I haven't seen the exotic telephotos for NEX (I know you can adapt alpha and legacy MAF lenses) and certainly not for Fuji.
My take, as with all CSC's, is that they are only really compact with a pancake. I'm happy with running 3 camera bodies, as each has a strength for a particular purpose. Adaptability is the key for me, but the M is never going to be my perfect camera, in the same way that my 7D is never going to be my perfect camera. But combined along with the T3i (mainly for video) I have a system that, for me, is pretty near to perfect.
Would I spend a lot of money on an EF-m lens? Probably not, as I would rather buy an EF / EF-s lens and keep my options open.