Porn is a good point
I want to correct the anonymous coward, people didn't start buying DVD over VHS for that reason at all, in fact if you survey most people they don't use any of the additional content on a DVD 90% of the time it is for the most part niche content and marketing fluff to bump interest.
The reason that they transitioned from VHS to DVD was for a number of factors. Storage being the top on peoples lists. you reduced storage space I think by just over 3/4.
DVD as a format itself was also lead by the pornographic industry. If they had continued to release adult films via VHS it wouldn't have gone as far as it did in the same way that it was said industry that created secure payment concepts for online retail.
It is fact that there has never been (cite) a general release film with multiple camera angles as an integral part of the plot. Pornography however rinsed the gimmick when it was first introduced.
The same will go for 3D. The minute Vivid start releasing good quality 3D movies, suddenly there will be an influx in TV purchases & other industries taking note and jumping on.
I've experienced lots of different types of 3D experiences and can safely say without any bias that it fails on the home front more than anywhere else because instead of an immersive experience which you find at the cinema (even if it isn't a positive one) it lacks greatly because of the constraints of the environment it is in.