Ok, I might not be able to express this ably.....but here goes.
First of all I have to say I am not a Luddite: I work on the periphery of Interaction Design, hacking hardware and doing some basic programming, and I've done (and continue to do) my research. In the field of Digital Musical Instruments (DMIs), our love affair with THE TECHNOLOGY has passed the honeymoon period; we are now evaluating the tactile, haptic and expressive affordances of THE APPLICATION of those formerly novel technologies. However, with the advent of remote gesture-sensing and multitouch technologies, I believe we are in danger of going back to square one - marvelling at the technology and overlooking its application. Perhaps this is less of a concern in the field of consumer-targeted Interaction Design (eg, tablets and gaming), where consumers are like puppies in a room full of butterflies, and will buy anything brightly-coloured. My worry is that this technology is increasing being applied in the area of DMI design, being vaunted as more immersive and expressive (read: 'more brightly coloured'). Novel interaction environments can enhance and encourage new modalities of expression and therefore new art forms. But please, don't called these interfaces "instruments" - if you can't touch it, you can't feel it and more importantly, it can't feel you.