This really, really sucks for people who paid good money for 32bit apps. Or even expensive external hardware items that require ancient apps to be useful. Even if the apps are removed from the app store (and Apple has gone on a rampage removing old apps), existing customers always could keep the apps installed until now. If apps stop working and disappear, they will lose a whole lot of the trust that people had in the app store. I'm also curious about how this will affect the usually impressive rate of upgrades to the latest iOS version among active app-purchasing users.