It depends on where you live and the fiat currency you use. In the US and most of the West, we all 'believe' our money is fine (or those that have not read 10 books on Economics and #Bitcoin anyway).

So Bitcoin is a store of value first and we will use the LESS valuable money (US$ or other fiat) for things.

BUT, if you live in Africa where the Government steals your money, or you family steals your money from you - Bitcoin is a currency life line too! Below video is a year old and has exploded since - it's a sight to watch/see all this unfold!

https://www.youtube.com/watch?v=d5AvBsxRMYk&t=66s