The problem being that 3.0 broadcasts are receivable farther from the transmitter than 1.0 broadcasts are, meaning more potential viewers and ad revenue. In my market, I can only occasionally receive the 1.0 signals, but the 3.0 are rock-solid and stable. But all those 3.0 broadcasts are encrypted ...

I think a3sa will be killed by greed and shortsightedness.
People won't be able to watch those channels, and that's that. No ad revenue for station, they will turn DRM off.
In my market this is the only ATSC 3.0 station with DRM, and of course they have it on ATSC 1.0 too...

How about the Fire TV Cube?
110.1 NBC /Wavy-TV Norfolk-Portsmouth-Newport News, VA

So encrypted channels don't work on HDHomeRun FLEX 4K + Windows 11 + HDHomeRun app... I found that surprising, but that's the situation.

However, my Fire TV Cube Gen 3 cannot play them either!

110.1 NBC /Wavy-TV Norfolk-Portsmouth-Newport News, VA