Rapinoe is 35. She is still an excellent player but is probably in her last cycle for the USWNT. I wonder if her take might be different if she were younger and still had a long future to consider.
I think there must be an underlying assumption among the pro-trans lobby that very few men will make the jump to top level women's sports. If that's the case, there will be a continual stream of one-off situations, but few enough in number that they can be brushed off as incidental disturbances in the force. Many of these will occur in girls' youth sports or in minor sports without a large following and with very little money involved.
This may be a safe assumption, at least for a time. World class athletes, male or female, are a tiny fraction of the overall player pool. Most of them are straight. The usual percentage will be gay. Vanishingly few will be trans, and most trans people don't want to call attention to themselves in the first place. The number of trans people who can play at the professional, national team and Olympic levels will be very small. And in truth, there is a lot of pride involved in top level athletics, and a lot of gender confused men who might be potential crossovers are probably too proud, as competitive athletes, to go that route. They would view it as cheating. All of them will have played informally and socially with women from time to time in sports like golf, tennis or soccer, and they will all know the difference in performance. If they have any pride at all, they would not want to beat up on the women in a serious competition.
HOWEVER: sooner or later, a transwoman will show up in a sport that matters. At this point, just to clarify the issue, I hope that an aspirational female with XY chromosomes and a beard shows up in golf or tennis and proceeds to sweep all the grand slam events and every tournament he enters for five years running. Or perhaps some fleaspeck country with no soccer chops whatsoever will recruit half a dozen competent gay men to run up the trans flag and dominate the next Women's World Cup, destroying the proud women's teams from the U.S., France, England and Germany by 10-0 scores. Or a couple of gay male players of D1 college caliber -- pretty good players who aren't quite up to MLS levels -- are considering life after soccer once they graduate and decide to take a chance on the USWNT, which would give them a way to keep playing and earn a low-six figure income doing it. Then watch the reaction when Julie Ertz, Lindsay Horan, Rose Lavelle, etc. get cut to make way for them. The debate would change really fast.
Right now, the trans influx is so small that it can almost be ignored by the general public. (Though I don't want to forget the girls and women in the affected events who are being cheated, even though the public isn't paying attention.) But if the women succeed in dramatically increasing them salaries and prize money in women's sports, the incentive for large scale male invasion would be huge.
That would be interesting to see!