I have an iPad 2 64gb. I hope Apple realizes the reason why I, and some others, haven't bought another one is my iPad still works great. I don't think people need the new items on an iPad as much as on a phone. I bought a iPhone 4s then iPhone 5 and I am still using the 5. They make good hardware and most people aren't going to buy the new item unless it is needed.
The people I know with iPad 2s, are keeping their iPad 2s. It still surfs the web fine, and plays all the games they want to play. The only apps I've seen so far that require newer iPads are the most graphically intensive games, which the vast majority of people don't play anyway.
Also, what people forget is that you can't get an iPad on some installment plan like a phone. You are paying the $400-500 for the device up front. $500 is the average price people pay for a PC laptop. My aunt spent $600 on her iPad 2 when it was new with 3G, and she no reason to pay another $600 when her iPad does the job fine.
With that said, I hope this debunks the planned obsolescence myths, because Apple has had 1000000x better software support for older devices than any android device I know of. (Not hating on android, I'm just saying) Of course, the iPad 1 was huge blunder hardware-wise. Apple pretty much had to kill it quick because it was already horribly lagging after 1 iOS upgrade.