It's that endurance in the platform that has me coming back. I have faith that Valve as a company is in it for the long haul to act as a game store platform and honor my digital purchases. It's allowed me to put several thousand dollars into them.
However, on the flip side, there are also a good amount of games on Steam that are totally DRM free and Valve wouldn't have to do anything for those games in the event they shut down.
Maybe, just maybe they would release DRM-free Valve games, but that is as far as I could imagine they would go.
The hardware itself was cheap anyways – like $50 for a Chromecast + controller (and even cheaper with deals and bundles), and you can still use both after the service shuts down. It was the $60-80 per game that was the deal breaker.