Lack of 3D content is often quoted as one of the reasons not to get involved with 3D TV at this stage...the other big ones being the issues surrounding 3D glasses and health/eyesight worries. Pricing too, I guess.
It's early to tell if the health worries are realistic, that's going to become apparent (or not) over time.
3D content availability is growing all the time - two new 3D TV channels gone live in recent weeks - Xfinity and 3net. Blu Rays dropping in price, and plenty of 3D DVD/Blu Ray titles already available, or will be when some of the current movies finish their cinema runs. Pretty much every day sees some news of future 3D movies.
3D glasses is a game, yes. Probably will be some time before we see 3D TV without glasses models on the shelves (well at an affordable price and of sufficient quality anyway). Will be interesting to see whether the current focus on passive (cheaper) glasses models from some of the manufacturers wins out over active LCD shutter glasses technology.
Personally I have no problem with wearing glasses, though of course the cost of buying extra pairs if you have a 3D TV and want to share with friends and family is a bit painful.
Pricing not so much of a big issue as it was for the earlier 3D TVs. Prices dropping, and there are some great models that are making it onto the best 3D TV lists which are affordable when compared to HD sets. Arguably not far off a time when all new models will be 3D capable (and internet connected)...and it'll all be taken for granted.
http://www.3dtvguide.org