But spending BTC is going to be much easier than Gold.  What do you do with a 1 oz coin if you want to spend 75 dollars on something?  Gold is very inconvenient unless you deal in large amount transactions at once.  I fully believe that in the next few years we will see things bought and sold for a few satoshi's.  That is where BTC is so much better in the long run.  Plus, you can steal Gold much easier than BTC if the holder knows what he/she is doing.