Different strokes/folks. You would need a keyboard, but if it had/has bluetooth support, you could just get one of those fold-able keyboards. It'd take less space and be extremely cheap in comparison to the Air, which might be a huge factor for some people.
When everyone's cell phone has that amount of power and can function as a PC, it's likely many places (hotels, airport, cafe, offices) will try to accommodate them by providing lots of display/keyboard sets.