The Eos3 was the camera that triggered my switch from Nikon to Canon. It was and still is a wonderful camera and I'd love Canon to introduce a digital version. Exactly the same concept but with a top-end sensor and I'd be one of the first in line outside the shop.
But I have been led to believe that Canon did not consider the eye-controlled AF enough of an attraction, many users just did not spend enough time educating the camera (yes, it needed to be taught about the users eye!) and having got frustrated with it, turned the feature off. I am still amazed by it myself, 45 AF points, all of them available and ready to focus seemingly at the speed of light on whatever I looked at. It AF's faster still than any other camera I have ever used.
While still a very popular argument in the forums, the theory that the resolution of lenses are/will be a limiting factor is, I believe, a discredited theory. It assumed it was impossible to improve the optics and that's just not true as we are seeing. Canon are committed to upgrading their "L" range of lenses and while they will never admit it, I think its a major factor. There was no need to produce better lenses until sensors reached the point of needing them, that point will soon be upon us so the lenses are now being improved.