Canon HAS the technology (they just aren't utilizing it),
Do they really have it?
I'm the first one to say Canon boldly milks their products to the last cent before innovating, but afaik the exmor sensor design is patented so using a smaller cmos structure wouldn't solve everything. As for the mirrorless future Canon does not have a good evf, nobody has, so for the time being the dual pixel af is limited to amateur/quick video. They might have new DO lenses, but nobody ever saw an actual product yet, so they might not even have that. They do use their (hybrid) IS system and good usm af in lenses. So what real innovations apart from the 20mp 70d sensor do they have they don't use?
Concerning the latter, I'm convinced the M2 is a short-lived products and will be shortly replaced by a M3 with dual pixel af, that's the reason they don't even export the model outside Asia.
and I am truly loath to buy an A7r.
I agree about what you wrote about Sony, whenever I get a Sony store I try their new toys but it's also not for me, I don't seem to be a Sony person. Nikon, well, I had thought long about switching before I bought my more expensive lenses for Canon, but I remained on this side because of Magic Lantern (focus stacking, focus peaking, bracketing, intervalometer, ...) and because I can program my own dslr.
Other than that, it's really just illogical brand attachment because my first dslr was a Canon 620 and I loved my EOS RT, but I don't doubt Nikon would also have been a good choice - esp. when buying Tamron and Sigma lenses, currently it seems a bit strange to favor Canon cameras below the famed 1dx/5d3 af system.