Failed Prediction: Based on the Ted.com Video, I would have to say the 1 laptop per child. I am not saying that it will not happen, but only that the cost of a laptop still prohibits ownership of 1 per child considering that some of our population simply could not afford that.
Successful Prediction: teleconferencing. We do this at work. The cost of sending a professional to a location, provide transportation, meals and lodging is expensive. There is also the cost of minimized output due to travel time. We normally budget 2 days lost due to travel to and from the destination. The other cost of traveling is that the professional is away from his/her family. It could add up to family stress.