Gold has been removed from the monetary system since 1971, allowing financial innovation to degrade the system. As the 'deer' have overgrazed, the reintroduction of gold as an apex predator will stabilize the system and drive a massive revaluation of gold as it re-enters the monetary ecosystem.
Gold mining companies give investors leverage to the gold price and, once the cycle gets going, the right gold miners can massively juice returns. Williams views them as a way to make money for those willing to do due diligence, but not as a way to preserve purchasing power or sleep at night.