I don't know maybe I'm just old school, but even after reading your posts I'm thinking wouldn't it be safer to revert back to AVID on PC ? Even if they laid off 200 people and the stock is trading at a record low, they certainly look well positionned to reclaim some market, no?
Dreamworks went with linux a while back and there pushing it ever farther...
Their key concern was scalability of software, hardware and network.
http://www.redhat.com/summit/dreamworks/index.html
It's hard to foresee just how scalable and how well the new generation of Apple hardware and software will "play with others" . But FCX certainly has failed in that department so far (see Walter Murch's interview:
http://www.macvideo.tv/editing/interviews/?articleId=3316346)