IMO, harvey wippleman has done more damage to the women's division than chyna ever did or will do. that was what made the division look like a joke, since it literally was one, and at the expense of some women that really could wrestle a decent match.
now (and i promise that i'm not sexist) i doubt that women will ever be able to hold the kind of physical match that a man can day in and day out and as consistently. but there are still plenty that can put on a decent match. the "bra and panties" styles of matches also do more damage than good. may be more pleasing to the eye, but it doesn't show off any wrestling skills and just makes the division look like a joke. IMO.
chyna was a rare breed, but not totally alone. didn't medussa have a title run in WCW, for whatever that's worth. so did david arquette. but still, she did. and didn't awesome kong fight guys in TNA? so it has been done before and since, but just not as often because that kind of woman is harder to develop. beth phoenix has done some of that stuff recently with mixed-tag matches.
i'd say that chyna did more good than harm, bringing credibility to the idea that yes, a woman can wrestle and even succeed against all odds. not all will be as great as she was, but i guess that's why she was the "9th wonder of the world", preceeded by andre the giant as the "8th wonder of the world". pretty big shoes to fill, but arguably the breaker of more boundaries than any other female wrestler.