In 2008, I was laid off after 8 years at a large company, and I'd been using the same tools for those 8 years. As a front-end developer for dev-ops shops, my skills were woefully out-of-date: We'd been using Sencha (JS) and Webware (PY), with some Python 2 Python-to-C libraries. I knew nothing about what the cool kids were doing. I sat down and in a few days taught myself Django and jQuery; I rebooted by SQL knowledge from my 90s-era experience with Oracle and taught myself the ins and outs of Postgresql.
And then, in the bottom of the recession, I took shit contracts that paid very little (in one mistake, nothing) but promised to teach me something. I worked for a Netflix clone startup; I traded my knowledge of video transcoding for the promise of learning AWS. I worked for a genetic engineering startup, trading my knowledge of C++ for the promise of learning Node, Backbone, SMS messaging, and credit card processing; a textbook startup, trading my knowledge of LaTeX for the promise of learning Java; an advertising startup trading my basic Django skills to learn modern unit testing; a security training startup, trading my knowledge of assembly language in order to learn Websockets.
I've been at another big company for four years now. Will things go to hell in March? I don't care. I have the one skill that matters.