Who knows what the percentage is but you know it must go up a significant amount.
Europe will enter into their own form of Quantitative easing soon to avert depression.. China is doubling their stimulus and we in the US are heading into QE3...all of these will have the longer term impact of debasing the currency and in effect increasing the relative dollar dominated value of gold and silver.
There are lots of pros and a few cons for holding the physical metal.
But you didn't ask for reasons, you asked for something that cannot be known. The future is uncertain. Plan on it. Asses the risks and probabilities (likelihood of another banking/debt crisis, currency crisis, etc.) and combine that with good money management (allocation, stop loss, etc.) then make your decision based on the facts. The future cannot be known.
Things are very uncertain right now, so it's a good idea to be hedged or protected. But the goal to be hedged against inflation or deflation or protected against a crisis is not a prediction of an all-out system failure, just good sense.
They make predictions on TV to sell air time because people actually think someone knows the answer. I watch the financial news so I don't get sideswiped in my positions by some report or event or pending crisis, not to hear opinions about the future. Have you ever heard of an analyst or economist that was right more than half the time? Ever? The future can NEVER be known, so why listen to that crap or worse, ask someone to foretell the future and make a "prediction"?
Companies make predictions because it is demanded of them, people want to know, regardless if it is impossible to know. Companies may make decisions and develop strategies based on a prediction, but the prediction itself is worthless.
Good timing is the ability to see reality and facts clearly and make decisions quickly of which position to take, coupled with good money management and stop loss if you're wrong. If you make money, you may call that a good prediction, but it's more luck and common sense (good business sense) than knowing anything about the future.
Don't know but if you remember, gold went to a high of $850 in the 80's and dropped to the $300's, easy to remember prices from 30 years ago. Had you purchased at $850 in the 80's and sold today at $1,652 you would've made a whopping 2.24% per year. Had you purchased at $300 in the 80's and sold at $1,652 you would've made 5.85% per year all at a time when the stock market was returning 18% to 22% per year. That doesn't include the spread which can be as high as 40% with gold which means you lose 64% of your money immediately. Somehow, I would expect more than 2% to 5% per annum from a $20,000 investment never mind the 64% loss that's possible immediately.