True that it's unlikely for political and probably other technical reasons but:
Paragraph 6: "One of those missions would need to be rescheduled to free up a spacecraft, as SpaceX does not have a fleet on standby in case of an emergency.".
SpaceX has five operational Crew Dragon capsules (206, 207, 210, 212, and 213).
206 is out since it's in space right now, scheduled to return in April 2026, and SpaceX has never turned around a capsule in 2 months before.
For the others, last missions were completed April 2025 (207), August 2025 (210), March 2025 (211), and July 2025 (212). In April 2026, the time since last landing for these would be 12 months, 8 months, 13 months, and 9 months, respectively.
206 has previously had turn around times of 5 months and 6 months. 207 has turned around in 4 months and 8 months. 210 has turned around in 5 months twice. 212 has turned around in 7 months, 8 months, and 7 months. (There are other, longer gaps between missions for these capsules but the relevant question here is how fast has SpaceX been able to do it when mission demand required it, so I've spared the comment reader the exhaustive list.)
Given these times since last landing for the four capsules currently on the ground and these demonstrated past turn around times, I don't see a capsule availability obstacle to launching a rescue mission between now and April 2026 and keeping the April and June 2026 missions on schedule.
Could the author elaborate on how it was determined that either the April or June 2026 missions would have to be rescheduled to free up a capsule for a hypothetical rescue mission?