Post brought to you by a member named "The Horror the horror" (sorry, couldn't resist).
Gaming won't go away from TVs, don't worry about that, it's just that Nintendo and Sony have failed to make a compelling product for gamers that want games on a TV. Both companies need to adapt to the new era of gaming; but if both fail, some other company with better ideas will take up that space.
Nintendo is planning on releasing a console with a new OS, so they can bring new consoles faster (every 1 or 2 years) and is compatible with all games previously released, like Android or iOS games. Sony bought Gaikai, I wouldn't be surprised if they make a gaming channel on platforms like Fire TV or Chromecast and see how the market reacts. Both companies are worried and will change in the future.