A central problem in the demand-side economy is that labor has no pricing power. While this sparked political revolt in the form of Trump's and Sanders's candidacies, little seems to actually be accomplished on solving this central problem. Consequently, companies living in supply-side world are kidding themselves if they think they can sell anything to actual people who earn a living.
There's a lot of simplification in what I wrote, but the point about labor having no pricing power holds. And to a lesser degree if the supply-side economy actually gives a damn about having a reliable floor of demand, they could find it in customers who have jobs that pay enough to drive demand.
I'm seeing this happen to a great degree in Southern California's apartment market. Rents keep increasing, but the incomes in the area don't justify the increases.