So what specifically happened with 3D is that executives, and jeffrey katzenberg specifically, saw "movie that you need special glasses to see" and thought "this would be amazing for anti-piracy!" because you can't cam rip a 3D movie. So it got pushed on moviegoers way beyond the actual demand, and got associated with rising ticket prices and a general annoyance. Instead of it being something special, a bunch of movies got after the fact 3D conversions that didn't add anything special.

We would probably still have 3D tvs if it wasn't such a botched launch, Lol