Exactly. There’s nothing about the basics that can’t be grasped early. Sure you won’t be solving weird indefinite integrals or differential equations, but the concepts should be delivered early.
With sites like Math Academy, anyone who can afford the monthly fee will be able to learn not just calculus, but linear algebra and discrete math and probability as well at whatever age they want so long as they're willing to put in the work.
I'm extremely optimistic about the future of mathematical literacy beyond the requirements for high school graduation.