Yes Francisco d’Anconia's speech in the narrative is the very essence of the story. It is the literary canvas if you will on which Ayn Rand wrote the entire story. However, I'm convinced capitalism should be in a proper balance with altruism.
Capitalism can be perceived to be the financial economic backbone of a society, altruism is the heart and soul (social economy). Because we do not just life for ourselves only, do we? And... who is John Galt?
:-)