This article is less about the iPad, and more about what it means to the future of computing. Apple has successfully turned a multipurpose device (140,000 apps at the moment) into something that needs virtually no tech support, crashes almost never, and always has the correct hardware configuration to run any of those 140,000 apps.
If this was taken to the next level... say, you built a 24" desktop display with this in it, and you allowed more then one app to run at once (something OS 4.0 might have in it), and employed it in an office environment, think of the money you would save.
Let's say you had 1000 people in your office. You would:
Save the cost of 1000 anti virus programs.
No longer would IT departments need to worry about what software is installed on desktops.
You could cut your tech support staff to probably 1.
Save on the cost of hardware (I can see something like this being cheaper, and lasting longer)
The iPhone OS as it is today can not take the place of an Office environment PC, but what Apple is putting in place on the software side, should make people like Microsoft and Intel VERY uncomfortable and people who just want to do there jobs VERY happy.
People have been talking about PC's as an appliance for years. SO far, the closest we could get is the hardware is so cheep, you can buy one, use it until it's old, and throw it away for a new one. That does not make a PC an appliance, it just makes it cheep. What Apple is on the path to do, is what so many people envisioned years ago.
This is why the article is called "Future Shock". It's the start of a world where computers in peoples homes and offices are far different then they are today, and most tech savvy individuals are having a hard time predicting what there place in it will be.