The thing is that there are some people (senior citizens being a good example) who don't need a "computer" for anything but reading email, viewing media and surfing the net. Those people could do that stuff on a blackberry or other smartphone but for a lot of them, especially senior citizens, those devices are too small to use comfortably. For those types of people, yeah, something like an iPad (especially one with a printer port) could be considered a "computer killer" if it didn't need a computer for things which, ironically enough, the average smart phone can do over the air without a computer.
