Right and because of color gamut issues (amongst others), you'll never see on your monitor at home or on paper what it is that you saw through the viewfinder that was glass and mirrors. In which case, what value does the optical view finder have if the colors that you see will not be the colors that are captured and displayed later?
To be fair though a monitor or a printer at home do have the potential to be much better calibrated than an EVF in a camera. The biggie for me though would be getting maximum dynamic range so I can compose for areas of a picture I intend to lift in post.
I can definitely see an EOS mount camera with some form of EVF(either replacing the OVF or a hybrid viewfinder) in the not too distant future if only to cater to the video market, not sure I see a Rebel next year though.
For one thing the Rebel line will likely be getting the 70D/7D2 sensor, I don't think theres a problem with that as the 7D2 is being sold on AF, FPS and handling not the sensor plus even the 70D now has the old 7D AF unit. You add in wifi as well and that's already a bigger shift in the Rebel likeup than we've had since the T2i/550D years ago.
My opinion would be as well that the EOS mount isn't really that well suited for very small mirrorless bodies. Of course any DSLR mount will have a long flange distance BUT the EOS mount is also pretty large compared to say the F-mount meaning more empty space. I spose you could argue that space could be used for recessed lens designs but I'm not sure Canon or Nikon want to get into the position of producing lenses that can't just not be used on certain other bodies but will damage them.
The EF-M lens lineup might not be very deep but honestly I think it covers a lot of the needs of the average entry level users anyway, maybe add in a normal macro lens(say a 50mm F/2.8 2:1) and I think you've covered 95% of the market. Canon have a real advantage in terms of lens performance/value at the moment I would say plus I suspect a lot of the reason for the EF-M project is simply to devalue the market as a whole. If theres an EF-M body with EVF and decent controls with that lens lineup I think some of the current high end mirrorless prices will not be sustainable.