This last spring, there were at least three major animes revolving around the concept. "Nanana's burried treasure", "No Game No Life", and "Mekakucity actors" all have title characters who are Hikikomoris.
Hikikomori (shut-ins / NEETs) seem to be a real problem... real enough that they've entered Japanese Anime culture as a new character archetype.
I don't have much Japanese exposure outside of anime, so I'm not going to draw conclusions based on this alone. But I thought I'd give my perspective. Everything seems to tie together: an economic downturn that prevents many young people from getting a job, the uptick in shut-in culture, and finally an uptick in the suicide rate... (which seem to only cause more Hikikomoris as their loved ones disappear and make life more difficult for those left behind...)