drothgery said:They'll change to digital. HDTV is digital, but digital isn't necessarily HDTV.
True, but given that networks are currently broadcasting SD-Analog and HD-Digital*, when the deadline hits the most likely scenario is that they simply shut off the SD-Analog broadcast and continue broadcasting the HD-Digital signal as their sole signal; there's no good reason for them to eat the extra cost of also broadcasting an SD-Digital signal when every TV on the market (and all the upcoming tuner boxes) either display HD natively or will downconvert the HD signal to SD when it needs to be fed to a SD box.
*I suppose it's possible that someone is broadcasting SD-Digital OTA, but if they are I haven't heard of it. Also true that some of the programs being broadcast on OTA HD stations are SD shows upconverted and pillarboxed into HD, but that's neither here nor there.