My dad remembers when his family got their first television. It was black and white, and there were only three channels available. But they were thrilled to be able to watch shows right in their own home. He never dreamed one day he’d have a device in his pocket that could play any show at any time in full color. In my dad’s lifetime—and even in my own—television has been completely transformed. The move from black and white to color amazed families starting in the 1950s. The spread of cable TV meant families had access to dozens, if not hundreds,…