I'm glad that OLPC has finally released what was originally put out as the vapourware-ish XO-3 concept three and a half years back. At the end of the day, though, that's "just" a change in technology (though a huge shift in hardware and underlying software!).
The bottom-of-they-pyramid microfinance approach doesn't even have to drop the education focus. While the returns on education are much to slow to repay loans effectively in most cases, grant programs or other implementations could focus on child usage. For example; the XO could be on sale for anyone; but only young entrepreneurs could qualify for the micro-loans, and they'd have to provide some explanation of how this would fit into their learning. Schools or education-oriented civil groups could to buy on credit in bulk, provided they could support both an educational aspect and a profit-making aspect. Grants could be available to even younger children participating in educational programs, skimming profits off of the loan system and successful entrepreneurs in a new G1G1 style program.