I've spent ~2-3 years programming in clojure and prototyped stuff in clojurescript. While I love it for the domains it applies and it has influenced my programming considerably - I would never recommend random 9-5 Java dev shop to go pick up Clojure - there's just no point - Java works fine for what they are doing and their developers know it - learning Clojure would be a huge investment and the benefits wouldn't really be there.
The same thing is true for jQuery -> React. If you're a front end designer who does some programming - you need to learn the DOM and CSS, jQuery is just a simple tool to leverage that more easily.
React is a fundamental change that requires a lot of relearning and more importantly the benefits are questionable unless you're dealing with the scenarios it was designed for. You need to have experience with existing tech (that is way more intuitive, like two way data binding) to see what problems it solves - that's not in the domain of a jquery programmer.
I also wouldn't call people who "just know jQuery" devs but rather designers who know how to code.
The same thing is true for jQuery -> React. If you're a front end designer who does some programming - you need to learn the DOM and CSS, jQuery is just a simple tool to leverage that more easily.
React is a fundamental change that requires a lot of relearning and more importantly the benefits are questionable unless you're dealing with the scenarios it was designed for. You need to have experience with existing tech (that is way more intuitive, like two way data binding) to see what problems it solves - that's not in the domain of a jquery programmer.
I also wouldn't call people who "just know jQuery" devs but rather designers who know how to code.