I think even if the Nigerian currency turns into a strong currency it will not change people's trust in Bitcoin because Bitcoin is still considered a valuable asset. In an investment context, investing in bitcoin is more profitable than other currencies in the world.
Apart from that, this option is also very difficult for the government to implement because creating fiat financial stability with a good exchange rate is difficult. The strength of currency exchange rates depends on world politics, world trade, national security stability, etc
I actually quite doubt whether the Nigerian government is really serious about banning Bitcoin or whether it is deliberately allowing its citizens to own Bitcoin even though the government has banned it. I am sure the government will not be able to stop bitcoin 100% because the Nigerian people are familiar and know how to hide bitcoin ownership, but if the government is serious about banning bitcoin then they can pressure the public and confiscate bitcoin ownership.
But I hope the Nigerian government can legalize bitcoin even if only as an asset. Like in my country, bitcoin is banned as a currency but legal to own as an asset and can be used in crypto trading and crypto exchanges