If anyone wants the point of view of one of today's "kids" (late teens, actually), changing "man" or "mankind" or anything like that is not worth screwing up the poetry of lyric. I've known ever since I could read that "men" in some contexts could mean me too. Don't change it. The poetry, the sentiment, and the flow of the words are so much more important than the actual words. And the usage of "men" to mean both men and women is not antiquated. The youth of today, of which I am one, still know that it has more than one defenition, although, I admit, I'm not exactly your average teenager, or I wouldn't be in this conversation.