https://www.weforum.org/agenda/2017/10/sweden-could-stop-using-cash-by-2023?utm_content=buffer40bef&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
No for me the word extinct is not the right term, it is more of a rework or they will just evolve into something new because bitcoins can never be our main currency because of the fact that their value is not stable and a lot of people so not want to lose money we just wanted to increase it. So more likely to happen is our country will have our own virtually currency that have a stable price and of course centralized because bitcoins are decentralized and so they can never be a official currency of a country but they can also be an alternative currency in the future because they still have value.