I think it will be a very long time, if ever, before electronic displays can equal a printed image:
1. The resolution of electronic displays is terrible when compared with the resolution of a print on nearly any sort of good paper. Apple has just narrowed the gap with its Retina display. I don't know when displays of that type will be large and economical, but it's bound to happen eventually.
2. Surface gloss is fixed in an electronic display but varies according to the paper used for each individual print.
3. When you get right down to it the surface of a print is three dimensional. Papers come textured in various ways and to various extents, and those textures have varying effects depending on the angle at which the print is viewed, ambient lighting, etc.. Electronic displays so far are only flat and smooth.
4. Electronic displays generally emit light and printed images reflect light. Kindleís black & white display comes to mind as an exception. This is like the difference between prints and slides in the old days, and itís practically impossible to simulate a reflective display with a transmissive one. Reflective color displays are probably possible, but whether there's enough demand to make them a reality remains to be seen.
Photographers and print makers are concerned about all this stuff because things like paper white point, texture, and gloss all affect the printed image in subtle ways and they want it to be "just right". Unfortunately I think that the market for prints will not support subtleties so none of the above matters. A large portion of the buying public is fairly to completely oblivious to the subtleties of a print. For many the advantages and "cool factor" of having an electronic gadget on the wall, on which they can change the image to suit their mood, would outweigh any of these deficiencies. For that reason alone I think printed images will become obsolete for most people sooner than one might think. On the other hand I think it will take a long time for printed images to vanish because some people (read "not the masses") will continue to want them. An analogy would be people who still make, and people who still collect, silver gelatin prints.