You know, I've seen this idea floated time and time again, and I still have to say that I think this is all smoke and mirrors, at least from an infrastructure perspective. My opinion is that you will never see an industry-wide move toward Data Centers without onsite staffing simply because the risk is far too great. Even in the example you cite above, there is huge liability and potential for disaster. Biometric security devices can fail or be defeated, and all I can say about infrared cameras, microphones, or any other monitoring systems is that while they are an important component to a successful operation, they're not going to do you a whole lot of good if you don't have a skilled engineering presence in the building who is capable of responding quickly when needed. If you have a chiller pipe burst with no one in the building, all you're going to have is some great infrared footage, and perhaps some nice audio of a friggin' electrical disaster while your mechanical contractor races to roll trucks to the site.
Disasters aside, a properly maintained, fully redundant site has so much preventive and predictive maintenance that has to take place in a year, you're going to need an onsite staff to coordinate and facilitate those operations. Even if you have service contracts set up for various systems (i.e. Chillers, UPS, Generators, ATS, STS, etc), you're still going to need an in-house staff to migrate loads as needed to allow various components to be de-energized for service/testing. Someone has to be there to allow vendors access to various areas of the DC and to ensure that everyone is doing what they're saying that they're doing. That is, someone needs to be there to ensure that someone isn't just "pencil whipping" the PM visits on your CRACs, or that someone actually went around and tested ALL of your smoke detector heads above and below the raised floor.....you know, someone to watch the watcher.
I guess my feeling is, while it's tempting for companies to get all excited and get themselves convinced that they're going to save tons of money by running their DCs with no onsite staff, an it just sounds so futuristic and science fiction-ey to imagine a facility being run by remote control, but if you really think about the potential for disaster and the liability, I don't think it's worth it. I think that if anything, someone will try it and will push the issue for long enough, and someone will have a big enough issue that has a big enough impact that makes a big enough story that we can all read about and say "shit, I'm glad that wasn't me", and suddenly, these non-manned DCs will be a thing of the past. I admit, these are just my opinions, and this being Slashdot, you are all of course welcome to disagree to your hearts' content.