The answer seems pretty simple. Populism is the result of economic failure. The 10 years since the financial crisis have shown that the system of economic governance which has held sway for the past four decades is broken. Some call this approach neoliberalism. Perhaps a better description would be unpopulism.
Unpopulism meant tilting the balance of power in the workplace in favour of management and treating people like wage slaves. Unpopulism was rigged to ensure that the fruits of growth went to the few not to the many. Unpopulism decreed that those responsible for the global financial crisis got away with it while those who were innocent bore the brunt of austerity.