Never Mind 3D; What About HDTV?

TV Technology reported today that “Blu-ray’s share of the video-disc market shrunk to its lowest level in recent months, pulling in only about 8 percent compared to standard DVD movie and TV titles, for the third week of February.”

There’s more here: http://tvtechnology.com/article/95636

So my question is:  If consumers aren’t even buying ordinary today’s Blu-ray titles, which work on existing HDTVs, why should we expect them to buy 3D Blu-ray titles?