I'm guessing their argument isn't that capitalism was a progression out of feudalism and that more steps are inevitable as well e.g. fascism or communism.
Because the imperialist powers will bomb it to pieces, install fascists in power, shock therapy the economy and the people, make them believe that they are not suffering because of capitalism, but because they went through communism and it would be even worse if communism survived
The timeline is based on the depletion of various non-renewable resources. To move it up, we just consume more. The good news for your desire is that capitalists desiring infinite growth are encouraging us to do just that.