Yes, you are right, but it is still a means of exchange. Nothing has changed much. We have given it that much value and now its more of an asset it is also not easy to get since it has a limited number in the system. Aside that, not all countries accept bitcoin and so it is best we give it value to become an asset for investment.

Can change, but i think in two-three years not now. And no by bitcoin but by another cryptocurrency, which will be better to using for mass of people.

Yes I agree with you because if you are investors you can see the bitcoin price now is not stable but I think in a long term the price might be stable.

How do you define failed?  Failed in the means of its value? if thats the case then that is not a failure because the price drop or price fluctuations to be specific are just normal and always happen in the crypto world. Bitcoin doesnt failed us to deliver a good service .bitcoin is not a failed currency because we did already see its success , if  bitcoin was really failed then we shouldnt see it becoming popular thesedays .

To be a currency would need a long process, do not think that bitcoin fails to be a currency because it takes time.

Right now bitcoin can not be currency for payment because not many merchant accept it and government dont have regulation on bitcoin. I think in the future when technology more advance, bitcoin can be as payment because with crypto we can more safely to store our asset

The price of Bitcoin is not stable but it is still not consider as a fail currency. The price is still improving, it doesn't increase faster but it is having a little improvement every single day.

I am not favor with this that bitcoin had failed as a currency. It is because for me the fight or the career of bitcoin is still fighting and going. In general, we can say that a thing or things had failed when it is done or finish. Yes it is quite hard for bitcoin to become a currency in general because it will fight against the most complex and most trusted currencies with also supported with the government but still chances are there. But if in the industry of crypto currencies the success of bitcoin will be not questionable because it already showcase its success.

Not yet. You still can buy much goods and services with BTC.
Yes, it's better compatible with big purchases, imho, like real estate, cars etc.
Probably full implementing Lightning protocol will solve this problem, cause transactions speed is much faster.