The meta-topic is about disillusionment, which in this profession comes from having to learn new libraries and knowledge that you know will soon become obsolete. Reduce the risk by focusing on learning what interests you (language & industry), and accept only interesting work if possible (or create your own fascinating projects, if you're the entrepreneurial type) -- or work as a contractor, where you pick your projects, focusing on your favorite language.

Don't let yourself become a cog in the machine, learning one company's proprietary library after another; to me, this is what leads to programmer burnout.

One of the challenges of a programmer (among other professions) is leading a balanced life; do not let your work define you too strongly.