Originally posted by Aristophanes It depends on if an EVF can replace an OVF. And, if they can do so economically.
Right now, they cannot.
Or, will everyone be willing to do without a VF and do all framing and focusing using the rear LCD?
Nope.
Keep in mind that what pros use is what many prosumers emulate.
First of all, you don't need to use the rear LCD, many mirrorless cameras have viewfinders that you hold up to your eye.
Secondly, I don't think EVFs have to be just as good as OVFs in order to replace them. You have to remember that EVFs offer some quite significant advantages as well, like exposure/DOF/white balance preview, face detection, zooming, touch focus and so on.
So they just have to be good enough to work satisfactory, which I don't think is far away.