Waiting for at least 1080p@60fps for each eye to become cheap, better tech to avoid motion sickness, tech for real environment vision (with augmented reality, picture in picture, complete switching from VR to external camera input AND/OR other ways) when the user wants it, even more comfortable headsets and last, but not least, more and better methods and techs for interaction with the virtual world and free roaming in it. All these things would help pushing SW devs to make more VR contents, BTW.