I believe that bitcoin is underestimated, I do not claim that it should only grow! But I'm sure that the future is for him! crypto currency in general, and bitcoin in particular - this is digital gold, many people still do not understand this. I'm sure that in ten years it will be so.
Gold and bitcoin are different properties and characteristic which are incomparable the former is a precious metal while the later is a digital asset, price-wise gold had been in existence for decades and will be continually stored as an asset based on the fact that unmined gold is vast and abundant spread across the universe while bitcoin had a fixed value of 21 million.
Although in terms of trading BTC/USD value had surpasses that of XAU/USD thus I don't any reason for comparison with bitcoin as digital asset and the ease in having access to it will enable it have an edge over gold.