i don't think there is too much to worry about right now, the tech is usually avalaible much wuicker than the media, when dvd playres first came out, dvd's were very minimal to buy, same with blu ray. When HDTV first came out, the HD channels weren't as rampant as they are now, hell you couldn't even watch local prgramming in Hd right away,
now granted with 3D it does seem to be taking abit longer to get as much media out there for the home consumer, but a lot of that is exclusive deals with manufacturer's, also not every movie is made in 3D and i seriously doubt every movie will be in 3D in the future either, it'll only be more of the animated, suoer-hero, and occasional action flick.
What we do need is more programming via cable, satellite or even OTA to get some real milage out of 3D.
I have a 3D set, and i do not regret buying it one bit, and i know in time there'll be more and more access to 3D, both in media, programming and even streaming options available