Ok, I just spent some time with my M3, using the EVF to view my photos.
To be fair to it, I couldn't really see individual pixels, so its poor 1024x768-equivalent resolution isn't that much of a problem, it seems.
But what did strike me was how little of my eye's field of view the image occupied.
A very welcome and useful improvement would be a souped-up optical system with a really nice eyepiece, so that the image filled much more of the eye's FOV.
My Dad makes telescopes. When I was very young, he made a terrestrial 'scope with a (bought-in) lovely eyepiece of a type known as an "Erfle". This eyepiece was a joy to look through. The FOV was luxuriously wide! It SEEMED to almost fill the eye's FOV.
I want that in an EVF!
Probably optically impossible, though.