Often to build more complex systems is a matter of changing the game entirely. Alan Kay talks about how the Arch allow craftsmen to write cathedrals with 3 tim

Often to build more complex systems is a matter of changing the game entirely. Alan Kay talks about how the Arch allow craftsmen to write cathedrals with 3 times more volume than the great pyramid and only 1/10 of the mass. (ie they used less rocks). They were using a complete different approach to construction. So if Negroponte and Mary Lou Jepsen want to get to a laptop of less than 100 usd. They need to reinvent the device. I don't know if it will be $75 or $150... it still will be impressive.