Interesting idea, reminds me of the days when all I had was a 50mm 'standard' lens. Yes, it does improve your technique by forcing you to be more thoughtful about compostion etc., but (and a very big but), I wouldn't fancy trying to get a closeup shot of a cape buffalo or an elephant with a 24mm lens! I'd rather be a nice safe distance away hiding behind a 200mm or 300mm hunk of glass[]


Apart from wildlife photography though, Asmodai's suggestion does have a lot of merit!