No. Schools benefit from economies of scale like almost everything else. If you have a school building designed for 2000 students and you have 600 attending, do you think it will be cheaper, the same, or more expensive per student to operate the building?

It will cost more per student, which leaves less money available for teachers so the student/teacher ratio would get worse. The facilities will not be kept up as required. Programs will be cut.

Also ignored in your analysis is that generally when school choice is available, the students most likely to leave a school are the high performers and the most likely to stay are the low performs and students with special needs, who are more expensive to educate and were previously subsidized by the high performers. If you compare the services provided to special needs students at a school in a wealthy area to the services provided to special needs students at a school in a poor area, there will be a massive difference in quality.

Yes because this is exactly what’s been happening for 50 years.

I’d understand this argument say in 1975, but in 2021 your argument needs some deeper analysis