This is a very interesting take, but then gold is not exactly money. I mean you just cannot pay for things in gold as easily. For example, you can't walk into a shop, pick something up, and offer to pay in gold. With bitcoin, you can still do it in places that accept it.
Well, this is one big difference between the physical gold and Bitcoin. With Bitcoin, we can use it as a currency though it is not yet as massive as we are hoping it should be. Just like gold, Bitcoin can also be easily converted to cash anytime online. The comparison between gold and Bitcoin will not be ending here, and I am sure that into the future people will still be looking at both assets side by side. Though I would say that the real gold does not need to prove itself and its value and nobody will ever predict that it can soon be valueless.