I use bluettoth headset most of the time, but there are sill cases where I end up charging my headset and phone. In those cases 3.5mm jack saves the day.
As it was mentioned before: making changes for sake of changes is not always a good choice.
For a quite new guy in programing for smartphones as myself, this kind of tech would be a nice opprtunity to test apps on the real thing. The thought of all the games my friends and I could create excites me to the point where I can barely sit still! :)