The Nigerian finance minister and other economists think so. They are predicting 10% economic growth per year in the next year(s), and think Nigeria’s economic growth could exceed that of China.
Nigeria set for 10% economic growth: http://www.csmonitor.com/World/Africa/Africa-Monitor/2010/0914/Nigeria-poised-for-big-growth-aims-to-be-the-next-BRIC-country
Africa’s richest man says (in a CNN interview) that “Nigeria is really the best place to invest.It is the best kept secret actually in terms of investment”.
Guide to doing business in Johannesburg: http://www.economist.com/blogs/multimedia/2010/09/doing_business_johannesburg
Nigeria’s stock exchange: http://blogs.ft.com/beyond-brics/2010/08/23/do-not-publish-nigeria-stock-exchange/