Yes. There aren’t many women that will have a fair shot in men’s sports.
NFL: you got 6’+ 225+lbs linebackers, 300 pound offensive and interior defensive linemen. They just would match up and get seriously hurt.
NBA: a bunch of 6’5+ men mostly, no woman would match up against that
MLB: Baseball and Softball use different sized balls and would probably need to regulate new sized balls intern a size of a baseball and softball if they were to combine the sport
NHL: Fights breakout all the time.
It just wouldn’t make sense. However I would love for the WNBA to be marketed better to promote female basketball, and would love to see more women’s sports get more national recognition and good tv deals.