I would love to see an Arcology, I always enjoyed Oath of Fealty mainly for the ideas he referenced about one. With regards to the article, a sustainable community built with the drive of someone similar to Disney might be able to work, the issue outside of money and drive is NIMBYs. We certainly have the technology to do it.

However, you don't need complete independence, I think energy independence and protecting the environment with a family and pedestrian friendly layout are the best achievable goals