Yeah, content that's natively Deep Color seems unlikely. However, I could see color upconversion at some point, where the player or display intelligently smooths out the gradation. If bandwidth is really an issue with Deep Color, then I imagine all of that video processing would end up in the display rather than the player. Native Deep Color? Maybe with holographic media, ultra high-def, and the successor to HDMI.

That's just a stab in the dark after zero research whatsoever.