According to evolution of money, trade was first done with the barter system, then it evolved to commodity money using Gold and it's kind,then into metal coins then paper money, later transactions where done with plastic cards, before it's evolved into electronic money and now crypto currency.
According to the evolution of money since inception, another currency may soon replace cryptocurrencies. Because the world is continually growing, there is a chance that another currency will emerge after cryptocurrencies.
About years ago El Salvador became the first country to adopt Bitcoin as a legal tender and there are speculations that other countries would also adopt it in the nearest future now my question is, with bitcoin being the leading crypto currency is there a tendency that it would become the generally used currency worldwide?
It has the potential to become the most widely used money in the world, but this is dependent on each country's adoption. Not every country will want to utilize it and make it a global currency. Country leaders like to have influence over the currencies that are used in their countries. There's a chance it'll happen, but there's a much better chance it won't.