I don’t think JS (or some other runtime) could plausibly be removed from the web on any time scale. People have a (reasonable) expectation that they can do app-like things on a network, and that surface area will find its way to manifest one way or another. At least having it on the web has somewhat of a limiting effect on the entrenchment of the biggest (and worst) privacy offenders, because the barrier to entry is lower than building a wide array of native apps.