3D seems to follow a similar pattern as most other display technologies to me. Completely new display technologies apparently need about 50 years of development time to reach maturity. Some 15 years before maturity you see a short early hype with products that are frankly just early prototypes that someone thought could make a buck and some 5 to 10 years before they reach full maturity you see a hype surrounding it with an explosion of gimmicks based upon it, marking the final sprint to full maturity. At least that's what happened with LCDs and plasma TVs (remember the hype over those crappy, overpriced, motion-blurred LCD panels in the late 90's?) and it will probably happen with LED matrix displays somewhere near the end of the next decade (depending on how fast the OLED printing technology develops).
The 3D technology is probably at the start of said final sprint. Even though it's not there yet, a lot of people are jumping the shark hoping to outwit the competition. A lot of companies will probably go bankrupt or get rid of their display department because they either don't have the means to hold out till the end or just bet on the wrong horse, meaning that when all's done there will be a few brands that sell mature 3D products that do work properly without people getting a throbbing headache (because that, like LCD's motion blur problems is probably the thing that still needs to be worked out before the technology is mature).
Now, glasses-based technologies are clearly entering their final development stage, but what about glasses-free screens? Apparently there are some TV's being sold based upon lenticular lenses (for 20.000 dollars no less), so it can't be really far off. Yet, you should not expect it to be available for cheap the coming 5 years.