IO9 has an article trying to figure out how James Bond can last as long as it has while so many other movie franchises seem to stop at #3. This is something I’ve wondered as well. Maybe they should spend less time trying to emulate Star Wars. Especially since the prequels proved even George Lucas himself can’t pull it off.
Bond, on the other hand has gone through numerous movies and actors. (Not being Snell I really couldn’t tell you how many of each.) The franchise continues to go without being known as James Bond 23 or something. More proof Hollywood needs to get their act together. Check that article for further evidence.