Good grief. EVFs are years, if not decades away from being usable in high-speed and/or low-light situations, plus we need a good factor of 4 increase in battery performance before we go that way.
A bit of an overreaction? He didn't suggest building a space elevator.
Space elevators are at least possible. EVF as good as OVFs are not possible, ever.
At least you confirmed suspicions of an over reaction =/
Who knows what will be possible in the next decade or so. I'll agree that it's not going ot happen for a few more years, but there's no way of knowing what will be possible in 10+ years, especially with anything technology related.
How are you going to be zero lag and zero power usage?
You don't need zero lag, you just need less lag than the user can perceive. I am told that people can not notice less than 20 milliseconds of lag... Olympus is now at 29ms with the OM-D EM-1... still not there but getting very close... I can't notice the delay on static objects but if I look hard and concentrate I can see it when I pan. ( I have not tried the OM-D EM-1.... that's with a PEN and the OV-4, allegedly the same viewfinder the OM-D EM-5 uses)
Also, an optical viewfinder is not zero lag, it is between 1.5 and 2 nanoseconds, depending on your camera
Zero power usage is a bit misleading too... the question should be how does the power usage of the EVF compare to the power usage of the shutter/mirror motors.