Usage of 'they' in English seems to be fairly common and it has only made the language better.
In general, I think that people are focusing too much on words (actions matter), and that equallity is ok, but freedom shouldn't suffer because of that. Also, some people take equality too far - I have a penis, and if you have a vagina, we are different, phisically much more than any other human with a penis. There are some things we do different (I'm probably stronger and need to urinate less often. You can give birth and can better feed infants.). We might have different interests, and there's nothing wrong with that. We also get different roles in life; when you give birth, you're phisically damaged and the child needs you, so it's better if I go to work and earn money (if financially necesaary) (at least that's what a gentelman would do).