Well, that's what everyone thought about the PC back in the early 1980s. No one could have imagined what you can get nowadays for less than $500. As component prices come down and less engineering is required to create a tablet, the costs will come down. I'd be willing to bet that in 5 years, there will be a number of tablets around the $100 mark. Not as functional or as easy to use as the iPad, but good enough for the low end market.