Are we going to see more memory channels for consumer desktop at some point from AMD or Intel? Apple seems to be the only one that offers it.
I'm not sure what you mean - I think the mobile 300 series can do quad channel already for its APU at least. I'd assume it can do more but do you not need more slots beyond that?
Am6 Socket isn't due for a couple of years. The current sTR5 used by Threadripper processors supports up to 8 channels of memory.