Sorry that I had to edit my post above a few times.
My 4k DLP projector arrives tomorrow: an Optoma UHD35x. As I age I'm getting farther behind the times.
We still have been living with ATSC 1 since the 1990s. IIRC I was a "first audience" for ATSC HDTV from station KQED San Francisco's very first DTV broadcast on 24 May 2000. We all were tuned in ahead of time, and the station manager in SDTV announced they were pleased to present a pioneering...
Monoprice and other retailers are already selling 8K spec HDMI cables. They will become standard and the older ones no longer sold.
Monoprice already sells a 48Gbs 6 foot 8K HDMI cable for 99 cents.
https://www.monoprice.com/product?p_id=31231
I remember the work I went through hacking a small color TV set in the 1970s to wire up a connector for preamp level audio output. The NTSC audio format was as good as FM broadcast audio of the day - my friends were amazed hearing TV audio played through my stereo system.