I went to talks by Walter Bender, Nicholas Negroponte, and others involved with OLPC at the time. At the same time I was working part-time teaching technology afterschool in the Boston Public Schools. It was pretty clear that the constructionist vision of education that the OLPC folks were promoting made sense for SOME kids, who were bright and self-motivated, but it wasn't where most kids were. A few of the kids I was working with loved working on their own projects and discovering new things. But for most kids, just giving them tools and letting them play wasn't really going to result in the kind of learning and creative expression that Papert and his colleagues were promising. We had a lot of trouble getting kids to even go to afterschool technology programs. The non-profit I was working for was even paying kids $500 to do the program.
I would imagine that if you're an education ministry with a limited budget you probably want to focus on efforts that are going to make measurable improvements for the average kids. I don't think "we deployed 1000 laptops, most of them are now paperweights or video game machines, but 10 kids are doing super creative things of their own initiative" is all that compelling to an education ministry.