PC Gaming is doomed if this kind of thing is how the future will work.
Maybe not. I've been thinking lately about future consoles. A lot of people seem to be so sure that future consoles will not even have a optical drive and instead have every game downloaded like Steam. If this is the case, then DRM has certainly affected the masses of gamers. Obviously, there are far more console gamers than PC gamers. Imagine this setup:
You buy a new console, and every game you buy is now tied directly to your account. You cannot resell your games, you cannot get a refund, and Sony/Nintendo/Microsoft all have the ability to take away your games at any time. If your machine is stolen or otherwise rendered inoperable, you may need to appeal to the company to get your games back because they might think you're trying to install games on multiple machines.
Now that might work with PC games, since we're such a minority and no one has the money/willpower to sue companies like Valve, but there are lots of people who have consoles. Do you think that kind of practice would go around for long? The right person will eventually be wronged, and lawsuits will follow. Hopefully the public will then see how draconian DRM schemes affect us and call for restructuring of our laws in regards to all of this. Those laws would have to apply to PC software.
Maybe the future will play out differently. I don't know. But I do know that there are more people who would love to sue Microsoft (rightfully so) than Valve. Maybe the ones to do it would be game stores, since everyone would be downloading games and retail boxes would essentially be gone.