First of all, if this is the only possible way for a tablet to look, why did all the other Microsoft tablets up to the iPad look vastly different?
Second, there're two famuos quotes:
"The obvious is always least understood."
and
"All truths are easy to understand once they are discovered; the point is to discover them." - Galileo Galilei
The problem here is that Apple invested a lot of time and thinking into designing a fantastic solution to a problem. But that doesn't mean that it is the only solution. Instead, people are now seeing the world from this point of view, and can't fathom that there is any other solution to this problem - just like before the iPad everybody thought that the Windows Tablet Design was the best solution.
Does the author really believe that the iPad design is the answer to all questions? The final? I bet there're better, more intriguing, more beautiful, and more usable designs that yet have to be discovered.