Companies are generally smart enough to have multiple server locations for just this reason. That's what the 'cloud' is all about. Data isn't stored in one place. Its spread out, duplicated, redundancies on redundancies. It can't be disrupted easily.
I should probably clarify, I'm not for high level DRM crippled games, DRM is bad. Heck, I'm even against system locked games (its the main reason I've not bought any digital games for my 3DS, because they are tied to the device, and not a personal log-in ala Steam) I'm just against the notion that physical media is integral to the video gaming* experience. I know its not, because I haven't bought a boxed PC game since 2004, and it hasn't slowed me down one bit. I'm not saying system locked gaming is the future (I sure hope its not), but direct download is. Physical media just isn't going to hack it for storage space or cost effectiveness 5 or 10 years from now.
*or Comic Books. Or Music. Or Books.