Which implies Airplay with lag. Not brilliant.
I don't see Apple releasing a new display (even an "affordable" one for which a ~$999 price tag is still a pretty optimistic hope) which doesn't have wired thunderbolt as its primary connection. Airplay would be a bonus for use with iPads etc.
...but then if you've got a desktop Mac connected anyway, why not just Airplay to that, and avoid all the hassle of needing to have your display connected to the network? Seems to me like there are two possibilities for putting an A-series chip in a display:
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a consumer display would appeal as a large-screen docking station for MacBooks - and when the MacBook
wasn't connected you could still use the display to stream from iPhones and iPads, and it might even make sense for it to be able to run full TVOS.
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a high-end pro display could support resolutions (there are 7k rumours), refresh rates and colour/contrast modes beyond what the M1 and Intel Macs still being sold today could support. So it would need to be able to handle upscaling, motion smoothing, colour/contrast optimisation etc. as well as, maybe, DisplayPort display stream compression. Then there will probably be a webcam and speakers which could benefit from signal processing. That's one reason - apart from the obvious "smart" features - why your large-screen TV most likely has an ARM-based A/V processor in it, and why
wouldn't Apple use an A-series for that, rather than paying Samsung/Broadcomm/whoever?