As you say, the keyboard was designed for primary school children, who have no trouble with it, and immense trouble with keyboards for adults. You can plug in a cheap USB keyboard, no problem.
The $100 Laptop could have been done, but OLPC and the buyer countries agreed that it was better to add more memory and storage, and use a faster processor. Also, the dollar was falling during the design phase. So the actual production cost came to $188, and the price to governments in quantity 10K was $189. More than 2 million have been sold, delivered, and put into the hands of students all over the world. (Later designs cost less, and we have every confidence in reaching the $100 price point due to the inexorable working of Moore's Law.) You can buy one on eBay for about $150. I own two, which I have named thing1 and thing2.
The $10 PC from India was a publicity stunt, not a PC, and never went into production.
The Raspberry Pi is $25, needing in addition a keyboard, display, external storage, and networking. That should come to about $150-$200. These guys just now announced the first engineering test build, and you complain that they didn't go into production yesterday.
"Please check your facts before posting nonsense to the Internet."--Beable van Polasm, alt.religion.kibology