Yes, a lot of people do not agree with the statement that the world is changed but its because of the difference of the life style of people of different countries. Peoples in third world countries have limited access to the internet and the local market structure for sale and purchases of commodities. But still I believe that bitcoin is the new era of currency after barter and traditional currency system.

It seems like it will happen because bitcoin will grow rapidly in new era.

For sure in the future we will able to use our bitcoin to buy things and services without worrying if they are accepting bitcoin or not because a lot of stores now are thinking about accepting bitcoin because they finally realized the significance of bitcoin as a currency. Bitcoin is one of the best currency so far so it is not possible to see it over the world as an accepted payment option.

The fact that the state today completely want to translate the calculations of citizens and businesses by bank transfer, then it really is. The digital currency is very much being introduced into everyday life and I think that it will be very quick to switch to a full digital payment of all accounts. Bitcoin can also be very fast, but only after the legalization of the country's crypto currency.

Bitcoin digital currency system is difficult to become the currency of the future, because the confidence and acceptance of the conventional currency is still so great.At the world level is still the paper currency as a legitimate and dominant payment instrument used by a wide audience.
"Digital transactions are something that needs to be regulated [the government], but if the creative product we leave it alone because it's creativity,"

Yes its a new currency in the internet because it is number 1 virtual currency. I consider bitcoin as a money because I can used it like that. In just converting it into fiat. I can now hold it and buy what I want. As of now bitcoin cant buy foods and other things but I think if government will accept it in the future then it can be used for that.

and i think that is already happening in some places, for example in Brazil there are some shops who are accepting bitcoin for shopping there and may be there are some restaurant who are also accepting bitcoin from their customers. and i am also very much hopeful that very soon we will also be able to use bitcoin in our shops  for shopping.

I don't think that countries with a strong currency like the USD or EUR will use Bitcoin on a mass scale, however, Bitcoin will be extremely useful where fiat currency failed. Hopefully, people in failed states will recognize the universality of bitcoin and will adopt it. There will be resistance from the government since dictatorships always want to control the currency, but if the people prevail it can pave the way for a financial revolution in the world.

I see bitcoin very well and easily taking the place of currency and becoming a globally used one, replacing them might be a hard thing but I see bitcoin usable worldwide (in addition to other currencies) in a way similar to USD now, being accepted everywhere.

It's hard to replace bitcoin more hard, because bitcoin is the most established and the most famous of all the other crypto currencies and now you should know that bitcoin has become legalized by few countries and more countries are thinking about its legalization now, so if the other coin come out to compete with bitcoin then it will be very difficult for them to take the place of bitcoin, however some coins are present but even they did not win over bitcoin, so bitcoin will be as # 1 forever and the new era of currency.