I think that's actually more of an artifact of the nature of introduction of tablets than a fundamental limitation. Over time tablets will become much, much more powerful and standard peripherals (such as external keyboards) will become more refined and more commonplace. I don't see anything particularly odd about the notion that someone in, say, 2023 might use a stylus with a tablet to produce various graphic arts, or sit at a desk with a tablet on a stand and type on a keyboard to write, or code, or do any sort of creative endeavor that is now possible with a PC.
There have been artists who produce the majority of their work on a tablet PC for years. They aren't as thin or as light as an iPad, and none of them have been perfect, but they are incredibly well-suited for drawing.
I just hope that Microsoft's efforts eventually cause Apple to implement a Wacom digitizer into the iPad.
