OLED still suffers from burn-in and the life of the panel still is shorter. For smartphones these two things are not that relevant because the battery gives away way earlier and nobody keeps their phones for a lot of time.
Gaming is not good for OLEDs. If you play the same game frequently (let's say, an RPG like Skyrim or an online game that hooks you up), you could end up with the HUD burned in your screen.
But TVs are expected to last a few years. So, until they solve the shortcomings of OLED, it's LCD all the way. OLED is a superior tech, the image quality is indeed better. But it won't look better anymore when you have a minimap and a health bar burned in your panel.