Nah, the lack of hardware is a real problem in developing countries, and is something that OLPC and Raspberry Pi are well suited to solve. But hardware is the easy part -- the much harder part of the problem to solve is the lack of human capital in computing education, and that's the part of the equation OLPC missed.
For example, they sent hundreds of thousands of laptops to Uruguay, but they hardly got used for education because the teachers just simply didn't know how to use them or integrate them into the curriculum. But Uruguay continued the OLPC model under the Ceibal project, and it's only just now, ~15 years later, after teacher training regarding technology is far more widespread and teachers have far more experience in utilizing computers in the classroom, that it's starting to show effectiveness. And the OLPC model is considered a success in Uruguay, but it took over a decade of persistence to work itself out.
So this is actually something that RPi is tackling head on -- the Raspberry Pi Foundation is actually working hard to develop curriculums meant to address challenges in developing countries, like poor internet connectivity (which means a curriculum designed to be self-sufficient), and then also putting a lot of effort into training educators. This is before they even try sending Raspberry Pi's out, and largely is designed around using the already limited computing devices they have (not RPis) because a lot of those governments are unwilling to invest in computer education (because they have bigger problems to worry about and consider things like every student having a computer to be a luxury when nutrition is a more pressing matter on the quality of education).
Frankly, even the idea of "most people there use x86 PCs or laptops from the used market or rescued from e-waste imports and repaired because they're much cheaper" is a fair bit of a luxury and lacking understanding of the challenges of computing education in developing countries once you leave the cities and start looking at rural populations. In Mexico, nationally, 45% of households have a computer and 56% have an internet connection. Once you go to rural areas, that's ~20%. And that's before you consider socioeconomic status and the disparity in access to computers and internet. Some stats put the lower-income Mexicans at 5% computer ownership nationally.
In Rural Mexico, it's normal for a computer lab of 30-50 computers to serve a school of 500-1,000 students, or for schools to have NO computers and instead send students to nearby schools occasionally to utilize their larger computer labs for learning computer skills, and that's the only computer access they realistically have. This is really a great use case for RPi's, but like I said -- the hardware is the easy part to solve. The fact of the matter is if you sent a crate of RPi's or any other computer to these schools, they'd sit in the boxes for years because they don't have the infrastructure or the human resources to start using them. And that's actually the part that RPi Foundation is focusing on first.