Capitalism has been around for a much shorter time than feudalism, and feudalism took hundreds of years to be fully overtaken. Imagine being a 14th century peasant saying "man, it looked like feudalism was declining for a bit there, but I've spent my entire life (30 years) waiting for it to collapse and it's still here, so I guess it must be the natural order after all."
Capitalism has been around for a much shorter time than feudalism, and feudalism took hundreds of years to be fully overtaken. Imagine being a 14th century peasant saying "man, it looked like feudalism was declining for a bit there, but I've spent my entire life (30 years) waiting for it to collapse and it's still here, so I guess it must be the natural order after all."