Exactly.
My laptop is my ONLY computer. I hook it up to an external monitor and use a bluetooth keyboard/mouse with it when I'm at home.
The iPad is ideal to me because it provides all that I need when I want to be portable with a laptop and syncs with my computer. I do half (or more) of my computing from my bed, and usually with my iPhone - because the web browsing experience is simply better with multitouch.
A laptop is, as someone else in this thread described it, an ENTIRE OFFICE. It has every single feature you need. A lot of people don't need both a desktop computer AND a laptop computer, but they have both - and relegate the laptop to basic and casual uses like web surfing and not too much else.
The iPad is the casual, cheaper replacement for those people. I am in that group and I will be getting one eventually because it is more functional for what I want to do away from my desk - not to mention more enjoyable to use.