React is a lot better than what came before it (Angular 1, Backbone, jQuery), etc. And I think it's longevity is in large part because it hit the "good enough" where the frameworks ceases to be a major barrier to productivity.

The newer frameworks (Svelte, SolidJS, etc) definitely seem to improve on React. But it will take some time for the wider ecosystem of libraries to catch up (and ideally for one of the newer frameworks to establish themselves as the next-gen "winner)