There are only two main user groups for tablets right now, AFAIK:
1) Field applications. Sales and service employees are often given a tablet with highly customized software.
2) Medical students. Apparently a tablet with MS One Note on it, is a popular note taking and learning aid.
Apple will have to create a new tablet market, whatever that is.
Such limited points of view, and not only your own, kdarling, but nearly everyone else's, too. I mean, really, a
Kindle Plus? Is that all you think a well-done tablet is going to be? I'll tell you right now that there
are no well-done tablets on the market right now; that's why there are so few tablets sold.
Now, touching on your own points --
1) Field Applications: Why should it just be sales and service employees? How many people still use clipboards as they perform inspections? How many people use note pads to rough-sketch designs and modifications on construction sites or manufacturing plants? How many of these people are using notebook computers because the tool they need simply doesn't exist? Of course, this also begs the question of the average consumer, after all, who, before Apple, thought that smartphones would become a consumer device? Certainly not RIM or Nokia.
2) Medical Students: Why strictly students? Why just medical? Why not any professional? The Newton was a surprisingly big hit with the medical industry, mostly by doctors annotating patient records. The best upgrade to that isn't a big computer cart that has to be rolled from bed to bed, but rather a tablet that can immediately send the doctor's annotations directly into the hospital's (office's) computer records. Much easier to carry and use, and doesn't require an assistant to roll the blinkin' cart around after him. Even lawyers could gain benefit from one, as well as police and military capabilities. In fact, anyone who has ever used a notepad or clipboard, even for pen-and-paper gaming, could use a well-designed tablet instead.
The point is, if Apple's tablet is the real deal, then it's going to be far more than just a Kindle Plus, it's going to be a true intermediate device between a smart phone and a desktop computer. It may not replace the laptop, but it could well eliminate the market for the sub-laptop in every way except price; returning the 'netbook' to what it was originally designed for--a low-cost device for education in developing countries.