All hardware products will suffer tradeoffs, and I don't necessarily find it reasonable to think that tablet computers should always be hardware-upgradeable, if it is at the expense of handle-ablity. The author's lament is that the iPad went obsolete before it broke. The PlayBook went obsolete nearly as soon as it was released. How did those Galaxy Tab 2s do? If the problem is that "it went obsolete before it broke", that's infinitely better than "it broke before it went obsolete".
I'm not saying Android is great here, I think it's a terrible system, but it's not nearly as artificially hampered as Apple's stuff is.
What's frustrating though is that I can pick up a 20 year old general purpose computer from the trash, set it up with software from that time (never mind the legalities) and play around with it.
Not so with the one iPad 1 I keep around... I think you can't install any new apps if you try now.