I think an extra device is the answer, for anyone who can buy, beg, borrow, steal, or whatever any sort of secondary iDevice.
Because you can't fight tech upgrades forever. It's the nature of how things work — tech moves forward. And it always will, whether you're talking about VCRs, car stereos, or iPhones.
Personally, my main device is at 11, and I always update it. My backup (an older iPad Mini I got for $50) is used only for games and will stay at 10.