If that is the case, then extreme over/under price valuations can be used to time swaps between gold and silver ownership, and you should be able to sell one metal when it’s overpriced and invest the proceeds in the under-priced metal. This trade would improve your profit potential as opposed to buying and holding only one metal over the long term.
In practice, you should sell gold and buy silver when they trade at the low end of its historic S/G ratio. This is difficult to do in shorter time frames, or when silver and gold have been tracking in tandem, but that is not what is happening now.
Right now, silver compared to gold is the "Perfect Storm" trade. When the bubbles start to collapse, silver prices will rise much faster than gold . The Silver/Gold ratio will eventually revert back to its historic mean, and likely overshoot it.
Keep a close watch on the directions that the Fed is predicting for interest rates. When the central banks start to panic, you will see them come out in force trying to prop markets up with talk. When "talk" fails and the markets start to collapse in unison, they will start dropping interest rates and go full bore just Like 2009.
The biggest "Everything" bubble in history is now upon us, and you can clearly see the effects of 10 years of Quantitative Easing.