I do not want to argue with you.
But anyway, releasing a new iPad every year is not unacceptable(unless you're "casual" and buy it late. But at that point, you don't care about the specs of the thing. Just want it to work as advertised. ).
Not like Apple will be killing off support for the iPad 2 very soon anyway.
Please don't lie to yourself - iPhones and iPads are like disposable cameras nowadays, when a new generation rolls in you can either update or wait patiently until your device proves to be "slow enough" not to support the latest update, virtually forcing you to upgrade your device. Of course, as deemed by Apple, not by factual performance.
By the time the iPad 3 reaches the shelves, iPad 1's will be worth as much as paper weights and iPad 2's will become less-then-desirable. I'm not even trying to argue, I'm establishing a well-known fact.
To further validate it, I can say that Apple purposely locked out SIRI compatibility with pre-4 iPhones despite the fact that there was nothing stopping earlier models from successfuly using the feature with no issues whatsoever, among other "quirks" of similar nature.