Suppose the government decided to slash (or integrate, or reduce, or ... whatever) science subjects out from elementary schools curriculum. What would the private elite (read: expensive) schools do? They would follow government's plan, yes?
I don't think so. More likely, they will provide additional hours for science with additional fee (rich) parents are more than happy to pay.
Or, private sectors will spot market for private course on science, especially for those wealthy parents whose kids are enrolled in public schools that have to follow the instruction.
By the end of the day, well-off kids get more science -- so much for a new curriculum that cuts science.