Who wants to use a terribly designed Youtube app on your Smart TV, typing with a remote designed to change channels and volume, when you could be using a purpose-built app for Karaoke and connect your Android tablet or phone via HDMI or Bluetooth using a touch screen interface to create a playlist or select your next song?
PS.....have you seen how popular "Karaoke" by Smule is?
It's big business, especially in China and Thailand!