There's no such thing as a "primary" signal. All that "10.1" is, is a label applied in the encoder.Scott... Actually in 1985 there were 6,600 cable systems serving more than 41.5 million households (nearly 50 percent of US households). Today, over 60% of US households prefer streaming over traditional cable. As such, the situation was MORE favorable for relying on cable delivery in 2025. Take my house for example, where we cord-cut a decade ago and have been relying on streaming plus over the air (OTA) via a rooftop antenna. The picture quality of the primary channel of the OTA signals is FAR superior for the main channel than it is for a signal's side channel(s). The subpar picture quality of the supplemental digital signals (less pristine and clear) causes a clear bias to somewhat avoid viewing those side channels. Also, for some OTA signals the primary station comes in quite okay but the side channel sometimes is pixelated or does not display at all.
THUS, it literally is NOT the exact same. Moreover, to your comment about streaming filling the gap... ABC does NOT stream its stations live on Hulu. CBS does on Paramount+, but the issue here is ABC... and thus for that network and for WSVN is there going to be degradation in the Miami/Dade/Broward market? My sense is yes, which I think will be borne out by the loss of no longer having ABC on Channel 10's primary signal.
ABC has standards for its affiliates about how much bandwidth its channel gets on an OTA signal. 7.2 OTA won't look any worse than 10.1 does right now.
Most of the other subchannels do indeed look worse OTA, not just because they're encoded at lower bit rates but because they arrive at the station in lower quality. Many of them originate in 480i or from older SD source material, unlike the pristine 720p that ABC sends its affiliates. That's not going to change when the label on the stream changes from 10.1 to 7.2.
And the rest about ABC not streaming its affiliates' signals? It's all exactly the same right now for WPLG as it will be for WHDH 7.2.
You're getting hung up on the ".2" in the label without a full understanding of how it's all going to work.
And yes, the number of households using actual "cable" is falling fast. I cut that cord a couple of years ago and have been very happy with YouTube TV. There won't be any significant change for viewers on ANY of those services.