Bitcoin never failed as a currency because it is supposed to be a digital money to be used for online market / transactions. Some people think that bitcoin is too bad to be a currency, because the media/internet is ruining the reputation of bitcoin. They say that this thing is just a scam and useless, which in reality, it isn't. That's why governments are still unsure whether to make bitcoin as their legal currency to begin with. Hey but who knows what the future holds. Bitcoin might be the flow of money in the global market, and prove people wrong of what they think bitcoin is. People just use bitcoin as an investment now.