In 2018 Lmao? 8k is not a thing yet for the mainstream and won't be for years.
With 77inch TVs and upwards for certain buyers and Apple agreeing with the new AV1 compression, I'd say that 8K is not far away at all. You only have to look across at Japan and South Korea to see the trends. ATV is not mainstream, that's DVD, Sky TV etc. If anything, future ATV could carry 8K just like ATV is beating 4K BluRay when it comes to Dolby Vision 4K.
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I wanted a load of these features back in the days of the ATV2/3, but I've now moved on and I think the ATV 4K is almost there. Built in tuners is never going to happen. Too many SKUs worldwide with many different standards and as has been mentioned an HDHomeRun and Channels App will fulfil this need. Audio is still an issue. DTS can be bitstreamed using Infuse (who have paid for a licence), HD audio can't yet be bitstreamed but again, Infuse will decode and pass it through as PCM. The reason Atmos and DTS:X aren't supported is that the height information is stored as meta-data and is lost if decoded on the ATV and the way TvOS works is to decode/recode to add in the UI sounds and Siri responses. I imagine that Apple is intending to introduce Atmos in a DD+ stream (i.e. lossy) in a future TvOS update. How an App like Infuse deals with lossless Atmos, I don't know. However, only 4K BluRays have lossless Atmos tracks and these haven't been cracked yet...
A second HDMI output for Audio could be useful for a few people - but again, if Atmos is only available over a DD+ stream, a lot of TV passthrough/ARC should be good enough. I suspect if you care that much about this, you will either have the OPPO 4K player which I believe you can feed the ATV into to aplit the audio, or will invest in an HDMI splitter (or will already have a 4K/HDR compliant AV receiver/Soundbar).
Infuse also acts an app to play items from a NAS which solves that problem. A TvOS update to allow 3rd party apps to add items into the TV app would finally let all your media appear in one app.
The only hardware updates I can see being useful are an HDMI 2.1 port which would allow QMS support to remove the blank screen when switching frame rates and VRR for games. I guess by the time this roles around, we'll be up to an A12 or A12X chip to give a power boost. Hopefully some kind of remote upgrade will come too - the current one doesn't bother me so much, but it could always be better.
Apple just don't care about TV gaming. If they wanted to push it through, they would have to bundle a controller and build real bridges to game developers and pay for some exclusives - iOS ports aren't going to cut it. I suspect, they have their hands full comissioning all these TV shows at the moment. Perhaps if the ruoured Netflix buy-out goes through they could look to push gaming more, but I think this will be years away.
Totally agree with everything that you're said here and a great explanation of how HDMI 2.1 will improve ATV whilst fitting in with Apples 'elegance approach' with no black screen switching!