I intentionally don't want to bring up El Salvador and the likes of other nations who have adopted the use cryptocurrency as a legal or not so legal tender.
What I am focusing on, is how inflation is causing hardship in the world right now and how those who have seen its potential, if plenty enough could form nations or breakaway or exist independent of its identity, and how Bitcoin having stood the test of market volatility, during that time would be number one choice as leading legal tender of adoption.
As crypto currency possess possibilities of earning opportunities for those who intend it as a means of income or for almost any facet that require its Blockchain technology, only but fractions of the population right now would survive and be masters, should there be new nation's breaking out and considering adopting Bitcoin as legal tender, or should there be a world disease/virus/zombie apocalypse. It would make sense because the old money systems are really either obsolete or have become insufficient to cover concurrent expenses due to inflation. Also, other altcoins have not had the stability nor publicity that Bitcoin has endured in the volatile markets and media/public eye, except for Etherum closely in the bracket.
The year when this might happen is in the nearest future of many nations now, wherein citizens have grown tired of government failed schemes and the knowledge of cryptocurrency has become almost like the gospel, both for commerce, transactions, profits.
*Do you think Bitcoin would be number one choice for any new nation's either breaking out or newly formed?
*What would make other altcoins qualify to compete to be number one choice?
In my opinion, the new state in the first years of its existence is very vulnerable. He needs international support.
However, if such a state chooses Bitcoin as its main currency, then it will become the object of aggression from powerful transnational structures (for example, the IMF). Traditional financial structures are very wary of the popularization of Bitcoin. They see risks to their comfortable existence in this process.
Therefore, such a new state (new nation) may, in my opinion, face aggressive pressure from such traditional structures, up to the downgrade of economic ratings and the imposition of economic sanctions.