This seems semi shocking. But I think this does more damage to E3. Not that it was somehow solely Nintendo. This I feel has ultimately been going on for years now dating back to PS Move & Kinect. And that disaster that was Sony's PS4 conference isn't helping either. I think the damage E3 will have this year will be complete once MS announces Xbox The Third before E3.
On the other hand Nintendo was already damaged dating back to the end of Game Cube. And its (literal) flailing with the white dwarf that was Wii hasn't so far helped Wii U.