I think this is a case where you are being far too optimistic, as in the "it won't fall without being pushed trope." While it is quite true that capitalism won't fall without being pushed in a way that leads to anything better, or even to anything only a little worse, it is quite possible in for capitalism to fall due to the causing the extinction of the human race, or a catastrophe that leads to the great die-off Derek Jensen cheers for. The social relation that followed even the latter would be unlikely to be capitalism, but would be unlikely to be anything very pleasant either.
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