I carry both a MacBook Pro and an iPad with me in my bag; the iPad is quite portable and easy to use when I'm standing and waiting for something, or perhaps I need to browse something on the web quickly.
However if I know I'll be sitting and attempting to do any serious work, I'll will take out my laptop computer and use a real computer. A physical keyboard and trackpad is much easier for me.
That said, I believe the MacBook Air and iPad can co-exist; of course that would mean added costs, weight, and bulk. Personally I'd choose a MacBook Air over the iPad, if I only had one or the other; with a real notebook, I can get work done on the computer; with an iPad, I'll either struggle with the virtual keyboard or I'll be playing games and not doing my work.
However if I know I'll be sitting and attempting to do any serious work, I'll will take out my laptop computer and use a real computer. A physical keyboard and trackpad is much easier for me.
That said, I believe the MacBook Air and iPad can co-exist; of course that would mean added costs, weight, and bulk. Personally I'd choose a MacBook Air over the iPad, if I only had one or the other; with a real notebook, I can get work done on the computer; with an iPad, I'll either struggle with the virtual keyboard or I'll be playing games and not doing my work.