Although I'm a tech fiend and love new gadgets I think that HDTV is a bit far-off for a country like Nigeria, if there's any company that will bring HDTV to Nigeria it will be DStv, there's talk that we'll get HD in South Africa over satellite next year, until then I'm holding off on buying a new tv.
Another thing to consider is that there will be a high demand for the spectrum used by over-the-air HDTV, government authorities might decide that instead of automatically granting it to tv stations they might want to auction it off and chances are that the big telcos will scoop up that precious spectrum.
Also another factor to consider is programming and the costs of HD to stations, they will need to get new cameras and editing studios, all this equates to a lot of money. So right now it doesn't seem commercially viable in the short term to broadcast HD in Naija.
South Africa should have over-the-air HDTV in time for the World Cup in 2010, in just over three years from now.
http://www.sadiba.co.za/