Some TV genres are perennials. They've been around since the early days of television, and probably are never going away — weekly drama series featuring doctors or cops, for example.
Other TV genres are like locusts. They get buried, lying dormant, until they suddenly resurface. On prime time TV, the game show was dead for decades until Who Wants to Be a Millionaire? brought it back. And quite recently, Netflix's Godless, like HBO's Deadwood years before it, did its best to try and revive the TV Western.