It's been discussed a long time. Nobody knows, but apparently he had been preparing his son for it. Don't quote me on that, it's what I heard

That's still a terribly small bus factor.

Indeed the danger is there, but their hardware is open, so there is always the option to switch.

Also piracy will go rampant if Steam stops being a good actor.

That being said, what alternatives you have? GOG lacks support for Linux, Sony cares doesn't care for you, Nintendo likes to s** all over you and their most passionate fans, Microsoft killed itself.

There is just no other option