There are two reasons. First, Bitcoin is a non-credit currency ten times stronger than gold. So unless Bitcoin is replaced. Otherwise he must surpass gold. Second, Bitcoin is close to being the ideal non-credit currency, and it is basically impossible to have another non-credit currency beyond Bitcoin. Combine these two points and Bitcoin is bound to surpass gold
This shouldn't be a competition, Gold will continue to survive and Bitcoin will always be here to, who cares which is better than the other?
They are both good choices for long-term investment, one is offline and one is online, I think it's a good combination for all smart investors.
I don't care if Bitcoin is twenty times stronger and I don't want to put them head-to-head to know which is better, they are both scare and Gold doesn't need the internet, where as the Bitcoin does.
Let's accept both for what they are.