On the other hand, if the games already have DRM and it gets worse or for whatever reason Valve goes under and you can't play your games anymore, well... you can't play any DRMed game without using whatever DRM mechanism they'll choose next.
In other words "No DRM -> DRM" and "DRM -> Worse DRM" have different outcomes.
> Valve has been doing business this way forever.
And Google's motto was "Don't be evil" and for a good chunk of their life they weren't. That worked out well, did it? I'm not saying Valve will do a 180 and squander all the good faith it acquired. I'm just saying it's not beyond the realm of possibility.