Sure an "All in one" application would have many advantages. But I think this Is not just about defining an interface; is about defining our profession. An "expert" on such a application should be an skilled video editor, audio technician and graphic designer.
As a video editor my tool is Final Cut. I have nothing to do with Motion or Soundtrack.
I would like to integrate Color as a plugin to work in the time-line.
I would also eliminate Compressor, as an stand alone application and I would implement a proper export option in FC/QT, instead of the crappy "QT conversion" (the only magic of Compressor, apart of the high quality filters, is that offers a bunch of presets to people unable to build their own one).
So for my self, improving Final Cut and the round-tripping would be the way to go.
Rafael
PS: I work with Color in a MBP (external monitoring) and works great. Renders fairly fast, as Walter points, compared with many FC plugins.
http://www.nagavideo.com
