Unfortunately we've made the critical mistake of setting up our entire economic system to require constant growth or the house of cards it's built upon immediately starts falling apart. It sure doesn't help that when this all becomes an active problem, climate change will also be hitting us in full force.

Now maybe we can actually maintain growth with less people through automation, like we've done successfully for farming, mining, industrial production, and the like, but there was always something new for the bulk of the population to move and be productive in. Now there just won't be anything to move to aside from popularity based jobs of which there are only so many.