First bitcoin is not a contender with the traditional currencies rather it's designed and invented on the motive of giving financial freedom to it community users.
It's not to be figured as a commodity to influence the economy rather profers financial obligations to interest of it community.
If we also look at it the other side, if countries have to adopt it for legal tenders in both acceptance of payments and services, it'd optimize the CBN and the local banking sectors to consider how they can regulate the unlimited printing of the fiats whereas, it can be scarce to an extend and then given it some values.

All of that reserve notes will loose values if not equivalent to every other fiats with it stable and efficient economic system because when bitcoin has become globally accepted, there'd be no valuable hedge on holding your assets on the reserve notes anymore but bitcoin which would play a more welcoming and accessible role to be compared to the reserve notes.
With the impression of bitcoin decentralized, the US and the USD influence on the global financial system will be shrinked as indirectly bitcoin has taken it place with the global adoption considering it also serves as assets which liquidation is more solid than every other assets.