Stations wanting to do ATSC 3.0 broadcast are required to broadcast the same content (within bounds of the technology) as ATSC 1.0 in that market. There's no re

Stations wanting to do ATSC 3.0 broadcast are required to broadcast the same content (within bounds of the technology) as ATSC 1.0 in that market. There's no required sunset for ATSC 1.0 broadcast like there was for NTSC. ATSC 3.0 isn't backwards compatible because it's signaling is different than ATSC 1.0. It ends up being more efficient getting a higher data rate in the 6MHz channel. The video codec is also more efficient (h.265 vs h.262) allowing more program streams per RF channel. It will be quite a while before ATSC 1.0 is mandated to roll over to an updated ATSC standard. Even then there's no reason you can't just buy a tuner for the new standard instead of a new TV.