I dont see the point in replacing gold but that will happen or not, it is not someones choice. Bitcoin has taken some of the gold market. Nowadays many people who own gold actually own paper, or digits, they dont have the gold stored at home or in a safe in a bank, and bitcoin has a similar function, but it is not centralized.
Exactly. There was one theory circulating last year that some gold holders are slowly shifting investments to bitcoin or crypto but it hasn't been proven. We can speculate that they have something to do with the price pushing to a new all-time-high last year. Imagine if bitcoin could get at least 5% of gold investors globally, that will be epic.
So, yes, they will probably coexist for a while.
Holding both have its advantages and disadvantages. But I'm sure that smart investors would love to get their hands on both assets. And we wanted to diversify as well so bitcoin will easily fit on a gold investors portfolio.