Definitely. Now my work/office travel bag is much lighter. The MacBook Air is so slim I can even fit it in my travel handbag, which is great. I can't do that the MacBook Pro. And when I am somewhere for a longer period of time I take both with me because I am used to wroking with two monitors. Add Internet to that and a cup of tea.
In a museum in Stockholm I saw a good collection of typewriters (yes, they are in museums already). There, you could see, as you say, some kind of desk typewriters and also portable typewriters. Because back in the day, business people also had to carry their writing tools, especially writers and journalists.