I'm very much in the same place as Wayne. While I would LOVE to see multichannel MQA, I can't imagine it being relevant to the success of MQA overall.

I know of zero non-audiophiles who have any interest in multichannel music, and even most of the audiophiles I know consider it impure. Even on this board, we've seen a number of us switch from multichannel to 818's with stereo pairs. (and they were coming from 861-caliber multichannel!)

It would be wonderful, but not commercially relevant in my estimation.

Living room: 818v3, Parasound A23+, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS