bitcoin is a digital currency... crypto currency is always risky because bitcoin price always up and dwon. I think people will be comfortable using BTC if the Price of it is stable but I don't think it will happen because crypto are really different from Fiat that's why not all people will use it or will be comfortable to use it.
People will get comfortable using Bitcoin as a currency or a store value when government regulate it and tell to the people thats its okay that bitcoin is a legitimate currency. Mass adoption is on going right now is this very moment people so the potential in it but majority of the people dont believe on it because they rely too much to the government information. If government approved it soon they will feel comfortable using bitcoin and soon price will get stable because of the demand. The high volatility is normal because its still early phase of cryptocurrency.