I think it will just be a matter of time before other sports organizations will follow after them.
Other sports organization should follow them sooner. It is really unfair for a biological female to compete with transgenders because of the obvious reasons and proven research that transgenders have a physical advantage over natural women.
Will there be a good market for this? I don't know but bookies will probably open a different line for the events exclusive for them. Would you bet if they do?
There will be some organizations that will try to market sports organized for transgenders but I do not think that they will succeed anyway. With the number of transgenders involved in sports, I do not think that organized sports for them will be that interesting.
I agree with these sports organizations to ban transwomen from competing in women's sports. I am a long time huge fight fan and I noticed the discrepancy years ago when a trans woman named Fallon Fox competed in mixed martial arts. She's not really special and was nearing 40s when she started in MMA. But I felt like she won her fights because she's got a man's body. She was stronger and punches harder despite her age. Although she lost once but it was against a future UFC fighter (best mma fighters in the world/special fighters). In Fallon's last fight, she broke her opponent's orbital bone, made its face a mess and was concussed.
This is one of the cases where some of the humanity who is in authority took a dumb step just for entertainment.