I think in order to achieve 3D at 4K with current bandwidth they would've sacrificed HDR, HFR and/or color space. Perhaps the members of the Alliance were not willing to go that route, or just weren't quite ready to finalize that part of the specs. Although I am disappointed that 3D didn't make it to the initial Ultra HD Blu-ray specs, I don't think that necessarily spells the death for 3D. It can be added down the road as the next revision (just like with Blu-ray) once technology matures and especially if glassless 3D becomes a success.
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