Why are consoles the most popular? Price? "Tradition," where wrist mounted and air-integrated computers are a bit newer and potentially introduce new tech problems?
The Cobalt looks awesome and philosophically I think the 21st century UI facelift is looong overdue in the PCD world (psst, next step for Atomic: wrist-mounted, air integrated and touchscreen :d). But I'm deciding which computer to get in the next month or two, and part of me -- specifically, the part I said "I do" to -- has a hard time justifying another hose and loss of buddy air monitoring on, say, the Oceanic Atoms, for a pretty interface. And paying a higher price for it, to boot!
Also, if the $1200 rumors are true for the Cobalt, I shudder to think what a wireless, wrist-mounted version would run... (and I say that as someone decked out in Atomic gear from fins to reg)