[mghackerlady]

He predicted capitalisms fall, (which happened in the 1930s) but didn't predict that instead of the workers uniting and rising against the bourgeoisie that the bourgeoisie would just rebuild it and continue oppressing the masses

[ClarityJones]

Capital continued to function just fine through the 1930s. Crops still grew on land. Dams produced electricity. Factories produced cars. What exactly failed?

[NoGravitas]

Capitalism is subject to periodic crises; the Great Depression of the 30s beginning with the stock market crash of 1929 was the largest of those at the time it happened.