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You can see this and more on the Dragon Cards Web site.
The last line in the Dragon Card text is “Her show was canceled later that year.” The Duncan incident was never cited as the reason that the show was dropped; just declining ratings.
This was a common technique for the networks: They would move a show they wanted to dump around the schedule, often to unpopular time slots. Fans had trouble finding and watching these shows, so of course their ratings dropped.
Another reason for declining ratings for a show such as White was if the Southern affiliates didn’t carry the show, fewer people watched it and of course (again) the ratings dropped.
Stations do not have to carry a network’s shows. Often, if a show is doing poorly in the ratings, they will opt for something with a guaranteed income that they don’t have to share with the network. Even the network-owned stations, such as WCBS or KNBC, are free to drop the network shows for, say, “The Billy Graham Hour.”