Yes Canon is very sucessfull and know what they are doing. Thats why they dominate. Why would they come out with a really good mirrorless and I know they have the technology already. It will canabilize their sales on the DSLR market specially the Rebels.
Why? Because otherwise Sony, Fujifilm, Panasonic, Olympus and all others will cannibalize their Rebels and all of their other DSLRs with the possible exception of action-oiented models (1D-X)?
They haven't so far and growth in mirrorless in at least two major markets has reversed.
That's not to say that there's no future for mirrorless, nor that mirrorless isn't the future, just that it doesn't seem to be the present. Why would Canon and Nikon risk undermining their supremacy by bringing out 'pro' mirrorless cameras? Isn't that effectively endorsing their competitors' efforts? If Canon and Nikon dump their legacy mounts, what competitive advantage do they have over the likes of Sony or Fujifilm?
I think that's the crux of Canon's current dilemma. They didn't want to rock the boat by developing mirrorless, but evidently elements in their hierarchy felt the need to enter what was a growing market (hence EOS-M and Nikon 1). Now that the growth has died, so has Canon and Nikon's enthusiasm for their mirrorless systems.
Who knows how this will end up, maybe EOS-M will develop into a fully fledged system (especially if there is room for a full frame sensor in the specification), or the EF mount may start to evolve towards going mirrorless. I suspect that this isn't fully decided at Canon and will depend on what happens in the market this year.