The "objective quality" argument is so damn stupid. Here's why:
1. It isn't true. People do actively support and follow inferior sports leagues all the damn time. Canadian Juniors. College football. Hell, high school football--there are stadiums in Texas bigger than NHL arenas. Women's tennis often beats men's in ratings during Open events.
2. It doesn't matter. It's the same concept in any business: Multiple options will always exist and there is no objective 'best,' though some things may be much better and more popular than others. Go buy a vegetable peeler, some will work better than others, some will be tailored to lefties, some will only peel beets...whatever. You don't have to make a single market-dominating megaproduct, you just have to sell enough potato peelers to not go under.
3. Starting a business is hard. Starting a large and ambitious business is very hard, and often involves a lot of debt. Most major sports league, men's or women's, starts in the red for years or decades. That isn't exclusive to sports. Using the WNBA as an example for "never work" across the board is silly because it isn't the lone model for a startup sports league, nor is it an extreme exception.
4. Minor league low-level baseball still operates. Though implicitly some are feeder leagues that might be holding small reserves of MLB talent, many are dead ends with low salaries and constant team relocation. But people still try, because they want to own baseball teams, and people want to play baseball even without pro prospects, and there are towns where people want to go to the ballpark to be at the ballpark.
Building a successful women's hockey league would be very difficult. It would have to be very regional an accessible but still have a good TV deal. And it would toil for a while, and probably need a lot of funding to survive early years. It's unlikely. But it's not impossible, just ambitious.