What framework was popular 4 years ago and is now unmaintained? This is a common remark that was true maybe 10 years ago but hasn’t been in quite a while. React, Angular, and Vue all have dedicated maintainers and millions of users, and have for several years now.

This is starting to no longer be true. We've held Angular/React in the top spots for a while now. Vue is probably next in line.

However, both front-end and back-end are substantial enough now and have enough frameworks and environments that it's really hard to do well at both. I'd much prefer more specialization, which would hopefully lead to higher quality.

i am not sure there are true top spots in the javascript world.

in my circles more and more people look at svelte to try to get away from frameworks altogether.

new tooling is always just around the corner: there is a webpack killer annonced every couple of months.

this very site is full articles "why we switched from/to react", etc.

in the javascript community "stability" is anything with a bit less churn than the bleeding edge. i think it will result in a massive burnout for a whole generation of developers.

Being concerned with a technology "falling out of fashion" is a personal problem not a problem with any framework. In any case, this is not a concern when using mature technologies which are the ones you should be using.