As one of those that didn't upgrade, it was because I was curious if the button free thing was really either an improvement or at least not a cripple. I let my friends be the crash test dummies. They like the buttonless thing, but wait! It tends to crash in the middle of a phone call. Whether it is a OS software glitch, a hardware issue or a network issue is not my concern. The fact I am not experiencing it on a V1.0 hardware design is. I am happy to be a trailing edge adopter. I went from an iPhone 1 to a 3GS to a 4S to a 8big. I am slow to update and am just fine with that. Hope I got those numbers right. Along the way I got an android Samsung burner and boy was that tragic.
Wake me when there is a phone with no buttons that doesn't crash on a phone call. Shake me when Apple listens to customers and offers a 2x battery capacity option INSIDE the case.