Chris:
Well the inevitable is no longer just on the horizon. Although 20inches, i think it can only be used by one person as it has an eye monitor like the DS 3D job.
http://www.stuff.tv/news/computers-and-consoles/news-nugget/lg-dx2000-3d-glasses-free-monitor-incoming
Won't happen this 3D without glasses. Well, certainly not for quite some time.
Look at it this way, 3D with glasses has been around for about what, 3-4 years? And we still don't have much 3D content. Granted, some channels aired are in 3D (how many though?). I think there must be around 50-60 odd movies available to buy as well. Not much really.
Will 3D kick off at all? Maybe. But only through movies which are specifically made for 3D. Like animated films. Those are the ones which will decide.
Now peaple have heard 3D without glasses. They assume it's about to turn that way. I would say it will be years till anything like that happpens.
Personally, I think high definition will be the way forward. We are at 1080p now and have been for a while. I think even higher resolution will be KEY for the future.
Just my 2 cents :-)