Bitcoin as currency? It's YES, For modern country's bitcoin already as currency because sometimes it use to pay some transaction but still depends on the country.
Just to be clear from all of us bitcoin is use as an alternate currency in digital form and our "FIAT" traditional money is still our main currency an no one can ever replace.

Here the actual problem ... Even when there's a merchant adopt Bitcoin as payment processor , there's a greedy government come to end the growth by making regulation to ban any crypto activity , that's really unfortunate and it's happening right now , you can see that kind case mostly in Asia zone , I've followed up it.
A slow adoption with a lot of challenge makes a lot of people switch it for a while to recognize Bitcoin as an investment, nothing wrong here.

Hi there brawdias! How can you tell that bitcoin failed as a currency? Just because you use bitcoin as investment it defy its whole purpose as a digital currency. Do you know that if bitcoin is not traded it could be on the graveyard today. Trading bitcoin is one of the driving force that makes bitcoin price high and low. It is because the supply and demand in the market which makes the value of bitcoin raises. Have you exactly knew that even the dollars or fiat are traded and they are called forex. Again, in that way the price of each currency could be determine.  

bitcoin has the function of both things, bitcoin can we use as digital currency and also bitcoin we can use for as commodity traded live how we use it

I think bitcoin cant failed as a currency because how comes that the company of bitcoin will be failed, they are the demand business in this industry because they are the best and  all requirements that investors or what is looking for or finding is in the bitcoin company so there’s no reason to failed them as currency.

The first thing we need as a currency is the popularity and the use of the crowd. Bitcoin is not enough people to start with and its popularity is not enough. It needs to be promoted in some ways. So for the time being, Bitcoin cannot technically become a currency because it The transaction speed is too slow, coupled with high transaction costs, Bitcoin is too immature for the currency.

The future can be changed and future of bitcoin too. But there  are a lot other coins and some of them can become leaders of the marketplace

I think it can not happen

Bitcoin price can only be stable if it is regulated so that may still be long way from being stable. That is the main problem as price can easily be manipulated by whales and big corporations. News here and there can easily bring the price down.

Probably yes because many people realizes that bitcoin is not the future of cryptocurrency because of its limitation. Many altcoins that exceeds bitcoin but due to the fact that it is the most trustable cryptocurrency and has been accepted by most people that is why many people still use it. I believe that if this scenario continue, bitcoin would have stabilize and can be use as normal currency of mode of exchanges.