I wouldn't worry about that for at least another 8-10 years. Remember that ATSC 3.0 will have to be formally adopted by Congress before DTV has any timetable for going away. I don't expect much unique to ATSC 3.0 (UHD, HGR, WCG) before the bandwidth used by DTV is freed up. Having to share the repacked airwaves with such a bed hog is no picnic. For those who like to talk about how much progress South Korea has made towards ATSC 3.0, I note that South Korea is a bit larger than the state of Indiana and has more than two and a half times the population of the state of New York.