For me I have to have an optical viewfinder anything else is a waste for me.
That is OK.
But I am thinking on a clip-on EVF (on the hot shoe). So you can buy it or not, just like any optical accessory viewfinder.
Many people use extreme wide angles, or macro lenses (the macro-elmar 90mm), or teles (90mm, 135mm), or multi-focal lenses (Tri-Elmars) and they have to buy expensive accessories: viewfinders, googles...
Live view + accessory EVF would replace all these gadgets, and it would allow new possibilities: new macro lenses, new tele lenses, new multi-focal lenses, new manual focus methods (like those explained by Reichmann or Dubovoy), more framing precision (when needed), more exposure precision, etc, etc, etc. And last but not least, a "solution" for R lenses, using and adaptor.