The data itself may indeed be utterly misleading in the assessment of future risk (actually, any past data, for that matter), but its very existence is a factor that should be counted in. Gold being highly valued as long as humanity knows it has a lot of credibility in respect to its past performance (as a basis for forecasting its future performance). Bitcoin, on the other hand, having been "there" for just 2-3 years (I mean since it got out of total obscurity), doesn't have such basis, thereby any assessment of its future performance (based on past data) is fundamentally erroneous and bordering on sheer guesswork...
Yes but also gold is not a currency (no matter how many gold bugs come bashing at me)
If you were to buy/sell stuff at a shop with gold coins, you constantly need to carry with you an
ultrasound detector , an
MRI scanner and a
scale to measure that the gold coins you get is .9999 purity.
With bitcoin you only need a smart phone and a link to blockchain.info , blockexplorer.com, blockr.io and if you are really paranoid then a few more links just to verify the transaction's authenticity.
Not to mention 30.000.000$ worth of gold is 1 ton, you cant carry that on your back, but 30m$ worth of bitcoin fits in your pockets.
And many more.
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Conclusion: Gold is more trustable now, but when people realize bitcoin's potential, nobody will want gold anymore. Atleast the demand for it will diminish significantly. A few jewelry here and there, but not bullion vaults full of gold.