They could be throwing in the towel with ATSC 3.0.......
Via World of Radio io group:
Line of Sight  04/25

ATSC 1.0 SHUT-OFF...OR NOT? There has been some discussion about a “drop dead” 2028 date for ATSC1.0
which would allow ATSC 3.0 to replace it. The general opinion is that a mandatory shutdown will not happen.
Doug Smith tells us more…

 A couple of notes.....
  I find it very hard to believe the 2028 end date for ATSC 1.0 will hold.
 On the stations' end:
  Converting existing stations to ATSC 3.0 will require extensive new encoding equipment - probably
around $50,000 worth (or more) for each station.
 In many cases, existing transmitters cannot operate at full power in ATSC 3.0.  
 (the peak-to-average power ratio is higher -- meaning higher voltages appear in power
amplifiers, power combiners, and filters for the same average power output)
 In some cases this will apply to the transmission line & antenna as well.
 (all that said, with more robust "physical layer pipe"s reliable reception may be had at lower
powers with 3.0)
  Many transmitters cannot be converted to ATSC 3.0, or at least cannot be converted without replacing
the "exciter", at a cost of at least $20,000.
 Often, the links between the studios and the transmitters will also require replacement.
  As more people "cut the cord", retransmission payments from cable systems drop, reducing broadcasters'
revenue.   This of course makes it harder to justify large expenditures.

 On the setmakers' end:
 Patent concerns that caused LG to stop making ATSC 3.0 receivers have not been resolved.
 The current FCC is unlikely to be interested in expanding the all-channel rule to require ATSC 3.0 in
receivers, and Congress is unlikely to be interested in mandating that the Commission do so.  For that
matter, I don't think the old FCC or Congress, from before last November's election, would have been
interested either.

 On the viewers' end:
 People buy TVs relatively often, but to expect every receiver to be replaced in three years is unreasonable.
  The advantages of ATSC 3.0 are not extensive enough to push adoption.
 Increased use of streaming since the analog shutdown means many viewers now have the option of not
watching linear TV at all.  Losing OTA TV no longer means having to pay for cable.

 I don't really understand why the NAB would be interested in forcing this matter.  It seems to me it would only hurt their members.  
I almost wonder if they want to see the FCC say "No", so they have a good excuse for taking their foot off the gas of the 1.0=>3.0
transition?
(Line of Sight DX, April, WTFDA)

RadioActive wrote:

Interesting, and I hope it's true! I like both of my current TVs and have no interest at all in getting another one - or two. 

A sentiment many feel including me. Even though ATSC 1 has problems, it good enough for most and waaaay better than NTSC.