As for the much longer term picture, you can see there is still quite a bit of mean reversion possible. This is a logarithmic chart. The linear chart makes the current bubbles look absolutely ridiculous.
"When you recall that one of the first moves by Lenin, Mussolini, and Hitler was to outlaw individual ownership in gold, you begin to sense that there may be some connection between money, redeemable in gold, and the rare prize known as human liberty."
-- Congressman Howard Buffett (Father of Warren Buffett) from a 1948 issue of the Commercial and Financial Chronicle