all those woul would "love to get a hybrid viewfinder" .. .could you elaborate in a little more detail, how exactly you would like to have that implemented?
* optical rangefinder with EVF overlay (Fuji X-Pro1 style) with or without optical parallax correction .. if yes, to what focal lengths and focus distances?
* fixed, semitransparent pellicle mirror (Sony SLT, Canon EOS RT) style?
or ... what else?
Willing to accept and swallow all the "unwanted effects"?
Let's face it, time is ripe for EVF. All that's needed is just one more little push ... a higher res [why not 4k?] OLED display with no discernible lag [lets say less than 3ms - or any other number you consider good enough] and no blackouts between shot. POf course combined with 100% mechanics free, vibration-free global shutter (electronic).
Anybody unwilling to accept EVFs will be relegated to using OVFs as long as those will be available in old-style "niche" DSLRs. Similar to analogue film cameras.
An EVF needs more than 4k to be good enough. An EVF with a viewfinder size the same as a 5D III and the maximum eye relief possible in a mirrorless body would need 12,000 PPI (I did the calculations for that here on CR a number of months ago) in order for the pixels to be invisible to the naked eye for viewers with the highest visual acuity (which is around 20/10, according to my ophthalmologist, who has given me 20/10 eyesights with contacts.) That results in pixels that are so small, they filter out some red light wavelengths at the longer end of the spectrum.
The best EVF's today have around 2600 PPI, so we are a LONG way off from achieving the necessary pixel pitch required to render pixels invisible. That, to me, is the tipping point. When I look through an EVF and see image, rather than a matrix of pixels, then I'll finally be willing to make the move. But making functioning pixels that are only 700nm in size? I dunno, reading about Sony's 2600 PPI EVF and the technological advancements behind it, it sounded like just that was a pretty amazing feat.
So, I'll happily take some kind of hybrid OVF/EVF. In absolutely NO way would I consider a rangefinder style viewfinder with parallax error to be acceptable. I expect such a hybrid to offer me the exact same advantage I have now with an OVF, so TTL for sure. I see no reason why Canon couldn't develop some kind of Color Transmissive LCD, similar to their current two-bit Transmissive LCD, that would overlay the pentaprism. In EVF mode, the mirror would lock up, providing a black backdrop, allowing the full benefit of a color T-LCD that should look/work just like any normal LCD. No reason it couldn't be OLED from an actual pixel technology standpoint, Samsung has already demonstrated transmissive OLED displays. Whatever the technology, though, that's what I would expect. True OVF when the mirror is not locked up, and a full color EVF when it is.