Interesting to hear the All Blacks are aiming at becoming the most dominant team in history. I don't think I agree with that as a strategy.
You might wonder why, as I was a member of Buck Shelford's All Blacks after the World Cup win of 1987-a team and captain who often talked about the search for the "perfect game"; a similar goal on the face of it. Buck was a driven man and an intense leader and that's how he motivated himself and others.
Overall, I'd have to say it worked. After winning the World Cup, we went on the longest unbeaten run in rugby history-22 test matches. We didn't lose a game until the end of 1990.
I think we did play better because of Buck's hunt for perfection - but I don't think you can really compare eras; there are a lot of differences between then and now. For a start, we played way fewer test matches then and the rugby world has changed a lot. We also had a collection of players who led the world in their positions - Sean Fitzpatrick and Steve McDowell playing 36-odd tests together without a break and going the whole 80 minutes each time; Grant Fox kicking goals at a very high success rate; John Kirwan's performances helped him become a Sir.
Back then, the World Cup was just something that happened every four years. Now rugby is besotted with it; it is the be-all and end-all.