No to be honest.
If you don't NEED sciences for what you want to pursue I don't think it should be mandatory.
The stress should be taken off of maths and sciences and put onto more language based courses. Lots of kids come out of high school without the knowledge of how to write an essay. but can do all these useless math tricks, and when they get to University, fail because they can't cite a source properly.
I get the importance of it if it's what you want to go into, but I want to be a lawyer. Lord knows I don't need to know anything more than my basic math skills to do that. And science? I'm sure what I learned in Grade 9 and 10 will be more than enough. And most University courses require English to get in, but unless your major revolves around science, it's typically NOT a prerequisite.
But hey! To each their own!
Edit: I'm talking past Grade 9 I guess. I didn't really learn that much more in grade 10 science than I had learned in 8th and 9th grade so it was pretty pointless. (In my school [and I'm assuming all Ontario {Canadian?} schools?] It's mandatory to take math through to grade 11, and science until grade 10, which at that point they become optional courses.)