There's a lot of elision in that video as to the true infrastructure required to institute this. In it's current form I doubt that the tech would be able to change the world for the better but in general it's an idea worth pursuing at least in the small scale/private sector.
Interesting point is that the amount of glass necessary over the top of the panels will hugely reduce their efficiency, which is still fairly low. Another point would be that in order to produce and install a full national programme would require a huge economic input and something in the region of a 50 year project scale. Before you reach completion, technology will have evolved to the point that continued progress and maintenance won't be viable. That doesn't mean it shouldn't be used and implemented in various scenarios, but a national project wouldn't be a wise choice.
As an aside, the last time I heard, the average US household uses something in the region of 30% more energy than it needs to in order maintain it's current lifestyle [citation not available]. Municipal, business and retail facilities are usually even worse than that. If you really want to effect real economic and environmental change then start by turning out the lights, both literally and figuratively. There is a reason the environmentalist's mantra puts Reduce before Reuse and Recycle.