Yes, there are a lot of NPM packages, just as there are hundreds of thousands of open source libraries. The volume of open source software in this world is staggering. However, the vast majority of them don’t ever see the light of day, or they’re used by only a few. This is not unlike the situation with Apple’s App Store, which has over a million apps, the vast majority of which are lying fallow because they’re not very good.
We can apply the same Apple App Store analogy to your React-Native claim: how many of those apps are actually worth anything? Or are they, too, lying fallow? (Disclosure: I’ve written apps for Android and iOS, and they’ve not been profitable. It’s a tough row to hoe for sure.)
I don’t put much stock in the “growth” that you speak of. But then, I guess we’ll see in a few more years, won’t we?