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.
The revolution would continue, it's time for the blockchain era, it has also shown the world its benefits as a technology but Bitcoin will not be able to be the world's dependent currency. The general name "Cryptocurrency" would do more though, but the world would ensure more safety and accountability in using it going forward.
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?
El Salvador has shown the world about Bitcoin's legal tender possibility, thanks to them. But do not forget that they are not depending on it alone, they only make it a legal tender. This doesn't stop them from spending their dollar along with it. Also, Bitcoin has a limitation if the world should embrace it, it has a limited supply of 21 million BTC and the world can't fold to solely use a decentralized system. The economy would collapse by virtue of this.