You say unrealistic, I say resist as long as possible! I am still running XP on my home computer. Why? Because it does what I need. No issues, no viruses, no problem. But as more and more software stops supporting it I'm sure eventually It wont be able to do what I need and ill upgrade. But nobody is forcing me. It will probably be the same with the app. But some here make it sound like its an "update now or else" kind of thing and that is not the case. I'm sure the old versions of the app and firmwares have still got some time to go before they are just completely unusable.
Doing this on a PC is much easier than doing it on an iOS or Android device, iOS being a whole lot more difficult.