It's easy after the fact to say "I told you so", but 3D never happened in the living room as we pointed out four years ago here.
Looking at the world though the same prism, here are my seven bullet points summarizing why UHD/4K will happen. If you're not sure what UHD/4K really is, see this quick guide here.
I. 4K doesn't require special glasses.
II. Almost any content can be up-scaled, making it look better in higher resolution.
III. 4K/UHD improves viewing experience all the time, not just during the wow! moments of a 3D movie, and never makes you seasick.
IV. Four times the resolution makes the viewing experience more immersive reducing the need for 3D content in the first place, and 8K will just do this again.
V. 4K/UHD will make 3D catalogues look insignificant in size as easy re-mastering of movies means UHD/4K VoD will be here before we even notice, which is what Netflix seems to be betting on.
VI. Workflows and post-production may indeed be tough in 4K/UHD, but they’re a piece of cake compared to 3D ones.
VII. Business models and device penetration are still holding back live 4K/UHD streams and the ink still needs to dry on HEVC. But the reason for being and value proposition oh live UHD is clear. What was a live 3D stream going to be used for?
I'll add-to or amend this list. Let me know your thoughts.