This is purely speculation, but value of precious metals is based upon their scarcity and trade value. Historically, silver has never been valued more than gold, as gold is much rarer and harder to come by. However, should a large enough amount of gold be discovered that silver becomes more scarce, or should a use exclusive to silver be discovered to be extremely valuable, then Silver possibly might become more valuable.
As it stands, however, silver is the 'poor mans' investment material, and will likely never be valued more than gold.






