I've become convinced that there's one attribute of VR headsets that's more important than realism, more important than presence, more important than input.

Once the novelty has worn off, the main thing that will keep average users coming back is comfort. And none of the bulky, unwieldy headsets that exist today have it.

I'm not sure if we have to wait until VR headsets become as unobtrusive as ordinary glasses or contacts before users get the level of comfort they'll need to use VR for extended periods of time. But we're nowhere near that level with today's technology.