And once there is an endless supply of precious metals, guess what those will be worth? Basic economics.
Look up Jevon’s Paradox which originally concerned the cost of mining coal and then using that coal for industrial purposes. Due to the high costs associated with coal, it was initially limited in possible applications by the return on investment. Improved technology changed that consideration.
Lowering the cost of resources always leads to a greater range of applications for the resource. The market to absorb production of a resource will grow when the price drops.