I don't think its because of that. It's more of how Apple decided to do the UI design for the original iPad. All they really did was increase the size of the iPod Touch which worked.... but was a horrible UI for any form of serious work. Changing an app required several steps and always brought you out of the app you were in, it never replicated the feeling of productivity you got on a computer, where it felt like you saw the whole picture. With a desktop computer, you always got this sense that you saw every UI element and that you were in master control. With the iPad, you just don't get that feeling; you get the feeling that the iPad is controlling you and that you have to adjust to how it wants to work.I didn't agree with Jobs then, and I don't agree with him now. "Personal Computers" will be around for a very long time. I love my iPad to death, but my computer is much better for getting work done.
My GF uses my iPad more than me, but she still needs my PC (she's using it RIGHT now) to search the web for work related tasks. People need PC's for work, and work isn't going anywhere. Every non-tech person I know in my family still need PCs for certain tasks, even though they use the heck out of Apple's mobile computers.
I feel that we will use our PCs less and less, but there's something about the desk and chair experience that an iPad can't replicate.