First and foremost John, you must not expose yourself to any legal liability in the States or here. Nor do I see it worth your while to seek any legal advice, you just won't have enough money and neither do I to help you.
I also see little sense in alerting the media to this as neither side stand to gain anything if you really think about it.
I think that your contingency plan is to have a name change available and known to members in case this escalates, (something with blueoval in it works for me). Though I would hate for you to loose the fordforums.com domain name unnecessarily if common sense eventually wins through and this action disappears.
Come to think of it "blue oval" may also be a TM in one form or another. Perhaps a common ground is to explore suitable names with Ford, this may also help them realise that they are playing with enthusiasts.
Obviously I can't speak for your US connections, but I would like to think that direct dialogue with Geoff P will shed some light about the fate of the Oz forum and perhaps what is driving the issue in the States (ie are they targetting particualr sights that they think are inappropraite or is it a global thing).
One thing I can tell you is that whatever you decide, I'm with you 100%.