who gets paid to support that ecosystem, and who does the paying? as a simple example, I use the hapi.js server framework (because it is awesome). At one point, it was supported by Walmart Labs. It isn't anymore - it's mostly supported by the original author (Eran Hammer), who is getting paid less than $5k per month to develop / support it via patreon (and take a look at the bimodal distribution on his patreon page). And that's just for part of the overall ecosystem.
Part of the excitement of js dev is that there's always really useful libraries being created and distributed (ramda, rxjs, react to just name three things that start with R).
Not sure there is a good solution here - we want tons of value, but I suspect nobody's willing to actually pay for it. Libraries like cross-env, ramda, and so on all are excellent, useful, well-written, and the authors are responsive.