Cypto will be worth more than gold for certain at some point in time in the future. Are you talking of a specific coin or the whole market cap for all cryptos? I think even Bitcoin can go beyond gold's market cap.
Bitcoin is more valuable than gold, this is because bitcoin can't be controlled by the government and is different from gold. Decentralization is a price that can be labeled much better than gold. When bitcoin can provide financial management freedom for its users, that is where bitcoin is more valuable than gold in my opinion. In terms of value, one unit of bitcoin today is probably the equivalent of 1 kg of gold. But decentralization is the real price that users want.