I am in full sympathy with all that has been said in this thread. But ems's opinion is out of step with what is actually happening in response to this PC impetus. Instead of chairmen or chairwomen or chairpersons, what we now have are human chairs, at least on the boards I sit on or chair.
But worse, by far, is usage like this: If anyone thinks, does, has or whatever, THEY ... This is rapidly becoming standard. The feminists won the political battle, and quite rightly in my opinion. Now as a result of their victory the language is being forced into new and uncharted territory.