Here I bring you a news to think about it:
https://www.bloomberg.com/news/articles/2018-03-26/solid-gold-casts-of-nelson-mandela-s-hands-sell-for-bitcoinSolid gold casts of Nelson Mandelas Hands has been selled for $10 Million in Bitcoin. I suppose that means that for the Seller Bitcoin is going to replace Gold. And for the Buyer it is better to hold Gold than Bitcoin
I think that what is going to happen is that both Gold and Bitcoin will have long life in parallel and some people will trust more the traditional safety of store Gold and other will trust on the potential of Bitcoin.