Theoretically, capitalism in its current form has a very limited lifespan already. I have read before (and cannot find the infographic I'm thinking of for the life of me) a very convincing scenario where capitalism causes a race to its destruction. I'll do my best to summarize. Capitalism drives creativity (not necessarily exclusively but to deny this point is silly), therefore eventually technology will advance to the point where every job you could possibly have is done by a machine. This results in "labor" being nonexistent in the traditional sense and since the central driving force of capitalism is labor, the system will cease to exist. The result is a place where you either must be paid for non-productive labor, or you must be handed what you need to live or perhaps thrive. This creates an interesting dynamic where full power lies entirely in the hands of those who controlled the means of production before labor went extinct, and the final result is more or less Huxley's Brave New World, only with corporations (that is, operators of the new labor force that doesn't require wages) being in complete control of society.