The $100 has always been target that can only be reached once more than 6 million units are mass manufactured, that was always the original idea. Intel tactics though, it has been proven in official state letters, successfully blocked OLPC from reaching countries like Nigeria, China, India, etc.
But even though they "only" sold 2 million laptops to children in some of the poorest places in the world, you can find plenty videos online http://olpc.tv/
, see how the kids and teachers are using those daily, it's a huge success. I mean comon, OLPC may have deeply changed the lives of 2 million families in more or less very poor third world countries. Sure enough, it'd be better they reached 2 billion kids by now, by they I mean OLPC or anyone else in the industry. It's all about lowering cost and lowering power consumption of laptops and also bringing internet everywhere.