More than 3 channel displays have been attempted by several companies, but I suspect they fail due to:
reply1) trying to convince content makers to use new custom high-gamut hardware to capture the new spot colors
2) you'd need a full video content production pipeline that can render to that color space
3) finding enough people to care enough to pay the (substantial) premium for niche production numbers.
4) Most content just doesn't warrant high gamut unless it's narrated by David Attenborough.
So, you have both a chicken and egg problem, and not that big of a TAM to warrant the struggle.
5) You'd need image formats that record those channels, and that in turn would cause problems for raw bitmaps with alpha (they either get twice as big or the pixels are no longer aligned).
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