Capitalism will inevitable faces its own downfall even if it has developed #its highest form. Its own expansion# or development will bring three effects: the growing anarchy of capitalism (creates further antagonism within the system), the socialisation of process of production (which lay down the foundation for a socialist state) and the increasing organisation and class consciousness of proletariat#.
There is little the ruling class in the capitalist society could do much to prevent its own destruction. They could not even impose proper regulation on the market to prevent crises and often fail to act upon crises (The Great Depression, 1997 Asian financial crisis and 2007 financial crisis).