I dont know who would actually make the switch. Bitcoin is similar to gold in many ways, only its much more convenient and because of its decentralisation its an amazing inflation hedge (as some already said). Store of value and liquidity is not an issue for bitcoin.
Bitcoin is estimated as a risky financial asset and I hesitate it can replace the gold as a cryptocurrency store of value. For replacement, there are genuine alternatives that volatility is lower than the daily velocity of bitcoin's price. Investors sell their risky financial assets when crisis nock the door and their money flows to safe assets like gold. I doubt they will transfer their wealth to cryptocurrency.