It all depends.
Bitcoin has already replaced gold for many investors as an investment vehicle or a store of value.
But there are still many with old thinking that will not do this too quick.
Then there are places where gold is better because it's physical. And in some cases real thing that you can see and touch will always better than Bitcoin.

But no worries, there's enough need for both in the world. And where Gold will not be available exactly because it's physical, Bitcoin will be there to replace it.