Women don't watch sports as much as men do. NBA, NHA, NFL, and the baseball leagues have fans spanning generations. Hard core fans can be second and even third generation of the initial family member who watched a certain team. And that initiator was most likely male, watching the teams that were in exsistance before women's sports was even a thing.
Yes, more women are athletes, and there has been efforts to create pro leagues, but they were all forced efforts in the wake of a big win and "OMG, MUST MAKE FEMALE ROLE MODELS FOR THE CHILDREN!!".
And then they failed, and it's not shocking. For the most part female spectators got into watching sports and being fans because of a male influance, father, brother, SO, who were not watching the female leagues. The rest of us just don't do spectator sports.
I played soccer starting when I was 8 till I was 20. I also played three years of basketball, a season of rugby, years of horseback riding and lots and lots of skiing.
Of those sports, I don't watch or follow any religiously, and the only ones I will watch if I see it's on the tv, are not any of the team sports, even the ones I played.
So basically, the efforts for professional league womens sports was always a bust. The women that do watch sports already have teams they want to watch, and most the rest of us just don't want to watch sports. That doesn't leave a large margin for fans to spend money on the tickets and merchandise that support such teams.