One benefit often overlooked is that during high periods of churn in an industry (let's specify JavaScript fatigue as a symptom of rapid churn in Software Engineering for Web Applications). There are more opportunities to quickly speed up your career. Fresh problems call for new solutions and fresh eyes to work on those problems.

The opposite of JS Fatigue is climbing the J2EE certification ladder - if we were all still building Struts/JSP apps then there would be no room for new ideas to flourish. I felt very similarly about Ruby on Rails in 2004, there was 4-6 years where someone early in their software development career to learn a stack, find work doing that tech and manage a team (exactly what me and several of my good friends did).