7) Failure of online services to make 2d and 3d the same digital product so you didn't have to choose.
This is a big one for me, both online and off. Separating 2D and 3D versions into two products (or as a more expensive variant to 2D only) leads to a chicken/egg scenario: I don't yet have a 3D setup, so I'm not buying any 3D content, so I have nothing to warrant a 3D setup, and round and round we go. If it was standard that buying a film online or a boxed disc got you the 2D and 3D versions, I'd have days worth of 3D content by now, and plenty of reason to be pricing up the hardware to view it.
It's similar to what happened with Blu-Ray. Once it became relatively commonplace for Blu-Rays movies to include digital copies, I started buying them far more because I was no longer having to choose between a DVD I could watch pretty much anywhere, or a Blu-Ray which looked nicer.