Statistics uses calculus heavily as well. It's hard to determine the probability of something lying in a range of a standard distribution without integrals.
On the other hand, 90% of the people going through college that take calculus are there to get education to do a job that requires little to no calculus. The hard part is predicting which 10% we should educate. Teaching calculus leaves the option open for that 10% to do the jobs that need it.
I think more discrete math - at least first-order predicate calculus - should be added to high school math. But that would not take a lot of extra time, you could sandwich that into other things.
however, in my last 10 - 20 years I've never actually calculated an analytical derivative. I think there might be some economists somewhere who are doing so, but in my experience that's generally because they don't understand enough about computers or modelling, and they're just roting 30 year old techniques.