i've had similar reactions to the "virtual audio reality" idea from over-50 year olds (a group i belong to myself), and all i can say is: "your objection merely strengthens my conviction that this technology will happen" ... because few things are more attractive to teenagers than being incomprehensible to adults.
and it's the kids that are now constantly IM-ing, iPod-ing, "MySpace"-ing, "Twitter"-ing, geo-tagging, and "web 2.0"-ing, that will drive adoption. old farts have a tough time understanding how important mobile social networking is becoming to youngsters, but the "always connected, share everything" trend will only continue to increase, and any technology that enables it will be highly sought after.
sorry, but saying you prefer "actual audio" to "network audio" is like complaining that email has destroyed penmanship (plus, i must say - posting a comment to an online article advocating physical contact over digital communication seems to me to be the very definition of irony :) besides, in practical usage, i suspect wireless headsets will actually increase your ability to enjoy the sound of the natural world, by decreasing the physical noise produced by other people.
imagine a party of cool kids, all wearing headsets, all tuned into the same DJ -- they can all dance to the same tracks, it's REALLY LOUD in their headsets, yet they can still talk to each other without shouting, and they can exclude everybody not on their wavelength, all at the same time -- and you won't have to pound on the wall to get them to turn down the horrifying noise they call music! how cool is that?