Yes, iOS gets their devices upgrade/downgrade, but is it worth it? what "features" do you gain from downgrading to iOS 6? messed up maps? passport? lol, pathetic.
If you just want to feel great with higher OS version numbers, just pretend you have iOS 100 or Android 100 right now on your device, and you'll be smiling till you drop dead. haha.
My point being, OS upgrade has hit a wall, it is no longer necessarily to update any more. my SGS3 gets much more love from me(running 4.1.1) than my Nexus 7 running 4.2.1.
As for my gf's iOS devices, they will forever stick with iOS 5, no way she's downgrading to that awful iOS 6 where you experience lag of death and battery life drain of death and be force to buy new devices!