Just in case this is news to anyone, Dallas has more women playing than men, not due to Serena at all, it's just what women do during the day. There is a TCD organization, Tennis Competitors of Dallas, that has the majority of the women's league participation, definitely more than USTA and the TCD mixed is more popular than the USTA leagues as well. It's mainly the country club crowd. Some of the country clubs have players that stick to this TCD format only or just play within the club and the most prestigious country clubs do not have USTA mixed teams nor do they have mens teams. The clubs are around $150,000 to $200,000 to join, then pay out the wazoo for fees and dues. Funny side note, some women go to ladies lunch in tennis outfits, they don't play tennis, they just like the outfits.
Anyway, that base of wealthy golf/tennis club people won't decline, but you aren't going to drag more of them into USTA either. I promise though, that country club lady crowd is the sweet spot for making money giving lessons, that and their children.
Maybe since the fitness craze is all the rage, well like all things in America extremes are all the rage, people are either getting really fat or going really healthy, maybe tennis could tap into that by showing it's more of a lifetime sport. I'm sure many of you have soccer friends who start tearing things and ruining knees in adult leagues, especially the tight confines of indoor soccer. IT's going to take something unexpected or dramatic to really juice up USTA though, maybe the continued building up of more public courts and facilities would increase USTA participation. If we all want it to increase or stay, we have to get some tennis players into the political systems in cities, have public park money go to courts etc.