If I were Stadia's marketing chief, I'd
1. Bribe the TV manufacturers to include the Stadia app
2. Advertise that the TV includes _a game console_ during TV commercials.
3. Allow the TV users to pay a bit extra ($20?) to buy a basic game controller.
4. Have all the store demo units to auto stream Stadia playing video games and explicitly explain you don't need a xbox/playstation to play these games.
5. Buy out Witcher 3/Call of Duty 4/Project Cars 2/other older games and make them free for TVs with Stadia bundles.
Most smart TVs these days are more than fast enough to stream HD broadcast. I don't understand why Google doesn't push this.
Fiddling with my phone to play Stadia on my TV is pretty crumple some. It's just too much work for normal folks. People just want to turn on the TV and start playing.
Edit: I guess monopolistic abuse is a concern. However Sony and MS have their own streaming services. Google can just advertise 'play games with Stadia and Playstation Now and Xbox Cloud on your TV!' I am 100% if players switch to playing games on TV without game consoles, it hurts MS/Sony a lot more than to Google.