Unity is publicly traded, Valve is privately-owned and Engineer-led and Gabe is handsoff according to all current reporting, so I think Valve is still good for the foreseeable future.

In fact, it's thanks to Valve that I no longer need windows to run games and have finally nuked it from my system a bit over a year ago.

So yeah, nothin remains good forever, but credit where it's due, and Valve's DRM is cosmetic at best, and trivial to bypass.