Even though the frameworks evolve quickly in JavaScript, nobody is stopping you with sticking to an "older" one if it works for your project. It's true though

Even though the frameworks evolve quickly in JavaScript, nobody is stopping you with sticking to an "older" one if it works for your project. It's true though that your value as a developer shifts quite fast depending on the trends. But I feel that a fast moving world is merely a consequence of super large communities like the JavaScript one. By "stability" I meant that NPM and Bower are quite reliable. Also, if you look at the usage stats for the top plugins, the still show in my opinion stability since you have a lot of devs contributing through pull requests.