Every other framework relies on JQuery so--yes, absolutely--it's still a thing. And if you don't work for a company that is in the JavaScript-framework-of-the-month mode, you should know JQuery is still king.
> Every other framework relies on JQuery This just isn't true. OP mentioned React, Vue.js, and Mithril. None of these use jQuery as a dependency. Neither does Angular, Backbone, or Ember.js.
But I think that's really only so the Ember jQuery wrapper will work properly. So you're still right.