That is a lazy argument that assumes that you need the Broncos for women in Brisbane to be interested in playing the sport, that is obviously false on the face of it because if that was true then the sport wouldn't exist in Brisbane at all because their was in fact a time before the Broncos existed. So if you need an existing brand and narrative to attract people to the sport how can the sport possible exist or be successful if there was such a time that no pre-existing brands and narratives existed, meaning that nobody would have been attracted to the sport in the first place, resulting in it dying with it's creators.
Look if I got the chance to speak with a women that was making this same argument I'd say to them do you want to be remembered as some chick that played for the same club that Langer, Walters, Lazarus, etc, etc, made great, or do you want the opportunity to be remembered as one of the great players that built a new clubs into what it is, i.e. do you want to have played for the same club as the greats or do you want the opportunity to become one of the greats made a club what it is yourself.
Because if you play in the female team of a men's club you'll only ever be a chick who played in the women's team that opened for the main event, where if you start your own club you not only have the opportunity to be the main event but you have the opportunity to write yourself into that's club history just as Langer had the opportunity to write his name into the Broncos history.
Think of it this way: Do you think it's better to be part of Sydney FC's women's team or part of North QLD
Sure Sydney FC is a bigger club than Canberra United, but Sydney FC's women's department is smaller than Canberra United's and always will be because most of Sydney FC is resources are focused on the men's team where all of Canberra United's are focused on the women's team.