The problem is young people watch shows on streaming. Young Sheldon actually had changing demos when reruns went to Netflix.
From the New York Times:
The show also struck a chord with viewers under the age of 34, according to Nielsen. Mr. Molaro, the show’s co-creator, said the Netflix bump became apparent to him when the crew was shooting a scene recently near a church in the Studio City neighborhood of Los Angeles. “Young Sheldon” had filmed in that location dozens of times without incident. But this time, roughly five months after the show began streaming on Netflix, it was a vastly different situation.
“There were hundreds of kids at the fence screaming for Wallace Shawn,” he said, referring to the 80-year-old cast member. “We were like, ‘What is happening?’”
So yeah, linear television is in a very bad state right now, and the last thing the affiliates need is for the networks to give up on them, because they have no Plan B. And contrary to the sentiments of a few people in this fandom, MOAR NEWS is not, I repeat NOT, an acceptable Plan B.