Nothing wrong with an EVFI camera. EVF and LCD displays have their advantages and disadvantages. I've used EVF cameras and obtained many successes with them, I'm not biased one way or another. There are times when the EVF is advantageous and other times when it is not. Just like the traditional Rangefinder vs SLR debates, there are justifiable reasons for why a photographer might prefer one over the other in all manner of shooting situations.
Given satisfactory resolution, the chief disadvantage of an EVF is the responsiveness of the display. No electronic display can ever be as responsive as an optical viewfinder ... there simply is no way that a display of any kind can display a change in the subject you're viewing at the speed of light the way a reflex or optical tunnel viewfinder does.
One advantage of an EVF is that it can be made to auto-adapt to the illumination and provide a clear view when there isn't enough light for any optical viewfinder to provide an adequate image for accurate framing purposes ... such as when fitting an IR filter for instance.
A high quality Electronic ViewFinder camera with Interchangeable (EVFI) lens camera is just about feasible today, given high resolution, large sensors that can run in dynamic acquisition mode without overheating and high resolution small displays that can be built into an eyepiece. I'm sure that some will surface in the next year or three.
And I'm sure when they do there will be the usual caterwauling and bellyaching about 'where's all this going? the end of photography is nigh!' and the equally nutty 'finally the godsend has arrived! at last there is a camera we can use!' on every equipment list, just as there is today over whatever minutiae du jour is at stake.
Because complaining seems to be the constant in this universe. ];-)
Godfrey