I repeat: the Canon mirrorless will be a "prosumer" camera, overlapping (and likely eating into) the high end of the PowerShot line and the Rebel line. It won't ever compete with the 5- or 1-series, nor will it compete with the ELPH series. It can't -- by the very nature of the design, it's got all those compromises that prevent it from ever being as good as an SLR, and
I couldn't disagree more - ALL cameras will eventually be mirrorless, including 5- or 1- series equivalents. Mirrorless cameras with EVF have many potential advantages. Increased fps, weight, reliability, etc. EVFs [with current AF technology] aren't quite there yet, but I can certainly see the day when they replace OVF - the ability to zoom and control brightness alone should settle the issue. How nice would it be to be able shoot your 85 1.2 wide open in a dark room and be able to confidently manual focus on someones nose!! How many times have people complained that they love the results of the 65 mp-e, but the viewfinder is dark and DOF is shallow making focusing difficult. If you can get the zoom functionality of live view with brightness control in an eye level viewfinder - that'd be the end of OVF.
Sure, and someday we'll all have flying cars.
Electronic viewfinders have a looooooooooooooong way to go before they can be a suitable replacement for a good SLR viewfinder. The resolution will have to get into the several-megapickle range at the least, and we can't cram that much into the LCD on the back. And then there's the lag...basically, the refresh and response rate will have to be in the 100 Hz range or better, and now we're into crazy talk with today's technology even on a large computer display, let alone something miniaturized to the size of an eye-level viewfinder. The computers can't push that many pixels around that fast, for starters. And now you want to add light amplification into the mix? With active noise reduction, I presume?
Yeah, right. Don't hold your breath.
In the mean time, the optical viewfinder works brilliantly for what it's designed to do, and the LCD with quick view satisfies the needs of virtually all of the remaining cases. Those few remaining cases involve available-light photography of black cats at the bottom of a coal mine, and pardon me if I can't be bothered to worried about the people trying to use a camera like that.
Again, the problem that mirrorless solves is size and weight. If you're doing the types of photography today where a real viewfinder is the right tool for the job, you probably don't care much about size or weight.