If you were shopping for a TV three years ago, you were probably bombarded with all kinds of talk about how cool 3D was and how it was the “next big thing” in TV viewing. Movies and sports would never be the same again, with characters and players popping out of screens and into your living room as if they were right in front of you. It’s now 2013, and 3D is but a footnote that barely measures up to smart TV features and the looming 4K Ultra HD resolution TVs. It all begs the question: Why didn’t 3D ever take off the way it was expected to?