I'll say the death of JQuery rather than being replaced by React or Angular, was more a result of standardization of ECMAScript and the progress of native APIs in browsers.

Before JQuery creating your own JS for a weird IE6 bug was a nightmare; but with that problem solved in the modern web development, JQuery killer feature became a little redundant.

I seriously doubt "native web components" or something similar will catch in the same momentum to kill React.