If in 5/10/50/∞ years, phones never get smaller than 3.5mm thick, how does this community respond? It's classic 'where's my jetpack?', right? I'd like to think that we all want phones that don't exist other than as a chip in our arm, or as a component of a ring, or as a wafer on our sleeve, or as our glasses, or [whatever other techno nonsense you fancy].
Those of you who want the jack are saying that this is it. For all of time. Three-point-five-mils is as thin as any of our devices can be. It's weird! :-)