I'd like some clarification on what you mean by "instead". The Order says that the stations have to simulcast on ATSC 3.0 so they can't just shift their subchannels to Next-Gen and drive everyone there with the content that they whacked from DTV (at least as I understand the Order).
That simulcast applies only to the primary channel, no?
ATSC 1 tower can have 2, or Lord save us, 3 “HD” channels for say, channels 5, 9 and 26.
The ATSC 3 tower can have those 3 channels in “better” HD, plus all of their sub channels. And throw in the “Basics of Basket Weaving” channel.
Then, after ATSC 1 goes away and all broadcasters have their own ATSC 3 tower, maybe the odd UHD broadcast.
I have doubts about what the incentives are to make this move to ATSC 3, but I suspect it’s gonna happen in a few years. Heck, maybe my next TV will have an ATSC 3 tuner. And maybe there’ll be something to watch in five years, and some incentive to actually do so.
I hope to be retired then, so my next TV may well be my last.