If the WNBA limits itself to biological women, they're dead in the water.
If the WNBA allows transgender women to play, they'll outperform all the biological women and/or drive the biological women away, but maybe, just maybe they'll perform at the same level as NBA players or better.
I think we both know what the WNBA will do next. Most bosses don't care how you get the job done as long as you get the job done.
