I don't agree, the major plus point of a networked system is they do have internet connectivity. I've run post houses large and small and whilst you have to police internet connectivity via Firewalls and so on its really not really so much of an issue for mac and linux based operations. Where it can be an issue is via Windows based operations where the potential for problems from malwear is much greater.
Premiere on Mac is a good move premiere on PC much less so, Apple strength lies in its ability to innovate and in recent years has created excellent and affordable hardware with a very solid OS. I think the point thats being missed is QT workflow has been the secret of successes here on Apple platforms, not so much FCP or any other app. If the media can be exchanged between vendors apps so much more becomes possible.
Dave Blackham