The myth of disruptive technology

I have found and read this story (called "The myth of disruptive technology")put forward by John Dvorak. He basically uses a chainsaw to cut down Clayton Christensen theory about disruptive technologies, and uses phrases such as:

"The microcomputer was never a "less expensive" and "inferior" replacement for minicomputers. It was a more expensive and superior replacement for calculators and slide rules. It was never used "instead of" a minicomputer (or mainframe for that matter) but "in addition to."

"There is no such thing as a disruptive technology. There are inventions and new ideas, many of which fail while others succeed. That's it."

Its a good read and it makes you think.