Let's say there are 280,000,000 people in the United States. 10% of that number is 28,000,000. That's more people than watch most television shows as it is. If 99% of the people didn't like a certain show, 2,800,000 people still like it.
Of course, you said "viewers." If 90% of TV viewers don't want a show to be on, it probably won't stay on the air. But not because of any noble democratic ideals - just that TV programming tends to follow the trends of what people want to see, and people evidently want to see repetitive, derivative, boring, idiotic drivel.

This discussion might be helped if you were to clarify what you mean. Do you think that the channel should be
forced to remove programming if 90% of the people don't want it?
As it stands, the answer to your question seems self-evident - most advertisers would argue that a 90% disapproval rating is not good business. But if you are suggesting that such decisions be codified in law, I'm afraid I find that idea rather silly.