This is a truly fundamental question.   I expect we will all come to such a moment of clarity when realizing all the possibilities that await us in a future with truly-free crypto-based payment systems.

We can also think about all the other applications that will be laid atop these personal block chains.   I envision a vast global web-of-trust system in which each person (and their digitally signed cryptocurrencies) have an ever-fluctuating exchange rate (on real-time, "free as in freedom" distributed exchanges).   The cypherpunk's dream, if you will.