One of the things I don't think it accounts for in talking about the downfall of something like jQuery is that as time goes on, the questions have already been asked. So of course there's going to be less questions asked about jQuery in 2017 versus 2009, because if I need to figure out how to select elements based on an attribute rather than a class or id, it's already there.
It just works, and takes up much less of my mindshare than trying to learn various frameworks every time I roll a new site (which incidentally is every 3 - 6 months). There is always more support for it (with all the questions being answered), and the API never changes. I actually develop faster, although typically I’m using web frameworks with templating backends - such as Rails (Ruby), Django (Python), Flask (Python), and Revel (Go)