I think carriers messing with their contract terms have somewhat blurred that cycle. For instance without paying a penalty I'm unwilling to sustain I have to wait six months after an October launch. And before this I hadn't missed a launch since the 3Gs
Along with physical keyboards....I never missed it (Lightning to 30-pin). Then again I DO recycle my old earpieces (the more recent ones anyway, not the round crap) so a way to keep them active for backups would be appreciated.
Particularly core features from competitors such as Google who have shown they'll throttle the iOS version to retain their own platform's advantage, that's understandable but makes offering an internal choice very compelling. Ex.: Look how rapidly Google improved Google Maps for iOS the minute Apple rolled out their own.
Aren't there Bluetooth headphones presently? The problem I see with anything wireless is the potential for further deminishing of the fidelity of the sound.... though it would be tempting to get rid of that tether.