Exactly WHY is the iPad neccessary? What can it do that cell phones, iPhones, Blackberrys, netbooks, and laptops can't do? It's completely unneeded technology. Does it REALLY have a practical everyday use that will last a long time?
Removing all peripherals and all user control from a computer, though, is not advancement. It's regression. At least for people that actually know how to use a computer.
Apple says it's a netbook replacement. Go figure.