I doubt it will happen, Ric - they were unsuccessful in stopping me trademarking the name because I'm operating in a different field, so they can't really say I'm benefiting from their reputation.
Likewise, I can't claim they're trading on my good reputation now, although it's funny to think so lol - there are a few restaurants around the place using Iron Chef though, and I suspect they may be in for a name change soon if they haven't trademarked...
I don't mind, every time someone Googles Iron Chef, I'm sure I will be pretty high up on the list