People will only consider using Bitcoin as a mainstream currency when it is completely accepted in the financial market.
I think it is already accepted in the financial market as there are transactions that are like 'BTC > item' directly, but in specific countries only (imk). So being accepted in the financial market is not the only thing to be considered for it to be available as a mainstream currency.
Also, the coin is currently too volatile to be a mainstream currency and hence is not a trustworthy exchange means. The coin has to be more stable for the people to do so.
I don't think trustworthy is right word to describe it, it is as if you're saying that BTC is a scam. True, stability is the right way for a lot of people to be confidently use it. But the thing is, its volatile given that its decentralized - achieving that goal is gonna be bumpy road.
Right now, the coin is a great investment asset to earn good profit returns but is not fit to be a currency.
Its volatility is a great perk to any skilled traders. Though its a
cryptocurrency, I don't think it would want to be the same exact purpose or meaning as a '
currency'