I love the idea of trading the gold/silver ratio but there's something else to consider IMO when prices are this high in terms of dollars.
Sure, if the G/S gets to say 40:1, gold is relatively 'cheap' compared to silver and thus theoretically it makes sense that you should trade your silver for gold. But with prices this high you may be better off selling your stack and waiting for prices to go back down to buy back in. Yes, you will have to hold dollars for awhile which some may consider risky, but you might end up with more metal in the end if you're patient.
Take this example from April 2011: The G/S ratio bottomed out at around 32:1 with gold at around $1500 and silver peaking at around $48. If you had traded your 1,000oz of silver at that time you would have gotten 32 ounces of gold;
However, if you had sold your 1,000oz of silver for $48,000 and then waited until the gold/silver prices came back down you would have ended up with more metal:
November 2015 gold price: ~$1,150/oz = 41 ounces of gold OR
November 2015 silver price: ~$15.25/oz = 3,147 ounces of silver
The G/S ratio in November of 2015 would have been around 75:1, so if you chose to trade your 32 ounces of gold back for silver you would end up with only 2,400 ounces. A great return, but not as great as holding the cash in the interim.
Now of course if there is some hyperinflationary situation where you're stuck holding cash then you sure will be SOL.