The problem with such installations is, that they quickly get obsolete one way or the other. Another issue that kills the idea anyway is that you need a cable for it. So why bother? Super small recharger or cable? One device needs a USB, another Mini USB, another Micro USB, a 4th one uses its own format in the other end. And to make it even worse, there is an A and a B model of all types as well to add on.
Hence its a silly gimmick to put in.
USB has been around for quite a long time now and even if it was replaced it wouldn't be expensive to change the faceplates. Also look at your charging cables - whether the device charges through USB/mini-USB/micro-USB/USB-B the cable is generally a standard USB on the side that plugs into the power source. Also USB is the same 5V everywhere in the world.
So now if you want to charge your phone anywhere in the world, you just bring whatever is the yourphone to USB cable and plug it into one of these USB wall ports and charge it without having to fumble around with international power adapters.
