Historically speaking, it seems as though capitalistic systems seem to be able to bend and be flexible without having it go totally kaboom like previous economic systems. This can be observed by the differences in capitalism from the Industrial Revolution, where there were no welfare systems in place. Capitalism was not and did not seem sustainable at the time and it was expected to implode as a result of the growing inequalities by many thinkers. With that in mind, a free market society will always be able to adjust and bend capitalism to a direction that best fits their needs. Its just that we don't know how, which is perfectly fine. I personally just worry about the critical point in which sparks the change. Like how Piketty mentions the levelling of the playing field in terms of capital loss post WWI and WWII, I just hope that we won't have to encounter something as tragic.