In an August report, the NPD Group estimates that roughly a third of smart TVs in the U.S. weren't actually connected to the Internet. That's down from about half two years earlier, but still not good. Researchers at Parks Associates found that even as more Americans are using smart TV functions, streaming device usage has grown even faster.

"If you're a streaming media box (maker), you've got much more ability to push new features out into the market at an affordable price," says Barbara Kraus, Parks Associates' director of research. "They're very stiff competition for smart TVs."

From the article "Why Internet-connected TV Sets Are Falling Flat With Consumers" by Anick Jesdanun and Ryan Nakashima.