And that's really a forced obsolescence. There is nothing in iOS 7 that is required by a tablet. And for a lot of businesses, there is no need to add iOS 7 dependent software.
Tablets are closer to PC's than phone's. In the world of business and education, there isn't a need to have the latest/greatest every 1-2 years. Companies and schools would be foolish to get on an 18-24 month upgrade treadmill if they don't need to.
The iPad 2 can continue to be workhorse for the next 2-3 years. And I wouldn't be surprised if Apple eventually markets the current 'Air' as a long term model after 2-3 years.
I don't question that, but does Apple actually accommodate the needs of businesses and education with this? Every new iPad 2 will ship with iOS 7 and there is no way to downgrade, as far as I am aware. It would not be so much of a problem if Apple would have at least reduced the price, but they still market it as if it was last year's model.