Could be. Angular growth has stalled for the past year or so. Polymer is pretty much dead.

OTOH hand why would Google invest in a React-based solution? Google could start from scratch an create the next best thing if they wanted to. To me it's pretty clear the future is a compiler based approach like Svelte, with support for SSR, partial hydration, static generation, and dynamically loading smaller parts of a page (eg: AJAX + hydration). All with a kickass DX.