but I believe that Bitcoin currency that every word across the nations will accept Bitcoin for each purpose but right now I think that bitcoin is still building structure and having more influence but with the time every other countries will make use of Bitcoin
You have spoken like a typical new recruits to the industry, Bitcoin doesn't have to be used by everybody in the world before it has an impact because there are some places that we can't see Bitcoin being used or it won't be as popular as other countries that have the facilities that'll encourage the use of Bitcoin over there. There are countries without good electricity and good internet hence people over they might find it very challenging to make use of Bitcoin because some of them don't have mobile phones or money to invest. They'll use their money for their essentials needs.
Bitcoin future role in finances will be surrounded around being an investment for most people because they'll still prefer to make use of their cash as it'll be less expensive and comfortable to use for them. Bitcoin potential will make many of them to not want to sell.
I think that as time goes on - more and more people and higher/bigger entities will see the potential in BTC.
It's inevitable and it will be a race of sorts what country or a group would be able to utilize BTC to the best extent - and help the community at the same time to bring awareness for what BTC stands for and why.