Even in 2021, NextGen TV seems far off from mainstream adoption.

Every so often, I’ll get an email from a fellow cord-cutter who’s worried about future-proofing for ATSC 3.0.

The big broadcast TV upgrade, also known as NextGen TV, represents a major leap over the current ATSC 1.0 standard for antenna users, promising 4K HDR video support, Dolby Atmos and DTS-X audio, on-demand video, and possibly better reception.
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https://www.techhive.com/article/3604331/atsc-3-0-in-2021-its-still-early-days.html