I think there are some easy gains to be made by removing most Euclidean geometry (including trigonometry) and adding probability and statistics. While historic

I think there are some easy gains to be made by removing most Euclidean geometry (including trigonometry) and adding probability and statistics. While historically there is a close connection between Euclidean geometry and calculus, I think people can grok ideas like a tangent line without having done any Euclidean geometry before. And probability and statistics are essential so people can properly participate the civic process. E.g. I used to see the following statistic a lot: "Women who are murdered are ~100 times as likely to have been murdered by their spouse, as Men who are murdered". I think a rudimentary knowledge of probability would allow people to realize this is a meaningless statistic (the meaningful version is "Women are 1.5 times as likely to be murdered by their spouse as Men".