"Some anti-trans activists think the days of cis dominance of women’s sports will soon be over, predicting that a wave of trans women athletes will usurp cis women at the highest level of sport."
Who cares what "some" anti-trans activists think? It's intellectually dishonest to defend you position by attacking its least astute critics. But this trans athlete issue is political, and politics does not bring forth critical thinking (which is probably why so many activists like to put "critical" in the name of their rants.
The Olympics you say? Before Laurel Hubbard, the only world-class trans athlete in the Olympics was a trans woman who won the decathlon as a man. Bruce Jenner brings up one of the great flaws in the trans argument: Exactly when does a trans woman become a "woman" for purposes of the sex-based Olympic categories? I put the last in italics to make clear that no other use of the sex label (and it is a sex label, not a gender label) matters here.. We are trying to hold an athletic competition with sex-based classes, and so we need to be able to determine an athlete's sex for that purpose.
Was Bruce Jenner "actually" a female when he won his gold medal? If not, why not? Did he become female when he came out? When he took his first hormone shot? When she put on a dress and make-up? Politically, Jenner was always a woman in a man's body. But Bruce competed as a male. Should he have been allowed/required to compete as a woman? You want women with penises to compete? Fine. Explain the rules for determining sex in a way that tells us what bracket a Bruce Jenner goes in at each stage of his/her life.
One more thing. There are so few trans female athletes that one would be amazed to learn that one of them was actually the best in the world at any sport. (But one might expect weight-lifting to be that sport.) So the Olympic experience tells us very little. But at the lower echelons of sport, trans women carry a statistical edge that organizers of competitions are justified in taking into account differently from the edge tall men have over short ones in basketball (and short men have over tall ones in baseball). The argument that we should treat statistical advantages based on birth assignment the same as those based on other innate physical advantages among cis athletes (Michael Phelps's "Aquaman" physique, say) proves too much. We can just as easily say that the statistical disadvantages of trans athletes competing in their assigned sex (e.g., those related to the transition process) are also just the luck of the draw.