This issue doesn't come up in high school because the whole class covers the subject at the same pace. The district elected the one-day a week live teacher plus online course for DS but I don't know how often the issue would have come up in the past. Although I am in a large district (over 100,000 students), there are many years when the district does not have a fifth grader taking Algebra I although it is my understanding that this year there is one other fifth-grade student within our district.
I don't think he will run out of math courses because after Calculus, he can take Linear Algebra, Statistics, Differential Equations at the high school plus he can dual enroll in college for more courses. Our district is very generous with high school credits. DS may potentially get 4 math credits (Alg. I, Alg. II, Geometry, Pre-calculus) and 3 science credits (env. science, earth/space science, biology) prior to high school.
