The real solution is using wired Ethernet instead of USB. This is a solution that makes the computer and its power unimportant. Cabling is unimportant. Even the playback software should in theory be unimportant, but I feel that it will be. This is why I am working on this solution now.
In other words, you are working on an Ethernet streamer or "renderer" that nixes the puter and takes its clocking out of the equation. Devialet and dBsystems (also out of France and which I used to own) have done that.
In your own words:
Have there been any disruptive advances in the Computer Audio DAC interface and how do you see this evolving in the future?
Certainly....
The next thing to look for is converters and DACs with WiFi or Ethernet interfaces that use ubiquitous software and source devices to deliver high-end sound. These will not eliminate the need to still do excellent designs and implementations and use low-jitter clocks, but it will eliminate the variability in sound quality due to computer hardware, software and cables. More folks will get better quality music playback for less money.
http://www.audiostream.com/content/qa-steve-nugent-empirical-audio-page-4