A thought experiment: Imagine a pre-singularity world with near-intelligent anthropomorphic robots which can do most manual tasks - including resource mining, food production and building more of themselves. Imagine most menial white collar jobs have been replaced by clever software written by people on this site. There are still some jobs for humans to do - in game design, fashion, service, music, etc. But any way y…
The simple answer to this, is that most liberal arts-oriented positions will morph into sales and marketing, and technical-oriented ones will morph into technical services (software engineering, maintenance). The world isn't going start starving, or somehow skyrocket into 99% unemployment rates. While there will be a "new norm" of higher unemployment rates for a while, that will quickly subside and people will find jobs, etc. We're just experiencing a cultural shift to a different type of business format. Call it the post-technology era.
tl;dr the sky is not falling