No,

Or to rephrase, No React has not won the frontend war in the way and scale that jQuery won the front end war. At one point something like over 50% of all new (at the time of its peak) web applications big and small included it? No. I mean jQuery actually really lost its stranglehold primarily because the browsers actually started incorporating most of its core ideas into themselves to a point where it wasn't 'necessary' anymore.

However as far as alpha geek mindshare, react has definitely overtaken everything else in the frontend world. At least from what I can tell.