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Meanwhile, free or cheap alternatives to pay-TV subscriptions are growing wildly popular. More than 180 million U.S. viewers watched 31 billion videos on the Internet last month, according to online data tracker comScore. That's more than double the 15 billion Internet videos that were watched at the same time last year.

Hulu, which is jointly owned by and shows programming from NBC, Disney and Fox, has more than quadrupled its viewership in the past year. U.S. viewers watched more than 1 billion free TV programs or movies on Hulu in March, up from about 250 million a year earlier, comScore said. That's nearly 27 videos per viewer, up from under 15 videos last year.