As for the OP I feel your pain. My aunt is a librarian at the school she teaches at and has her Master's in it just like you. It is sad that so many people don't appreciate a good book. And also sad that they can't even write a coherent sentence.
Just to play devil's advocate towards the math and science. Those are subjects that are universal. So I think that pushing them is extremely important in our world economy where people are very mobile. Math here is the same as math in Germany for instance. Whereas good english grammar isn't universal and won't do you much good on a global scale.
That being said, English skills shouldn't suffer though. And it is atrocious at how poorly so many people write and speak these days.