Can anyone think of a credible reason that Nigerians would need crypto or embrace it as a credible means of payment instead of the naira?

Probably based on current fundamentals and methods of pricing assets it would look like BTC is overpriced, the long term those fundamentals might change as the Crypto economy adapts. I believe time will tell but if you are a believer then follow your instincts as we are in unchartered territory.