I'm not sure we can ever get back to the techno-optimism that characterized much of America in the past. This article seems to suggest that we as a country can become optimistic about the future again by having a World's Fair. That by doing so we'll recapture a shared vision of the future and a shared cultural purpose that we had until it started to fall apart in the 90s. It's a quaint idea, but it doesn't seem likely to succeed in bridging the widening gaps between various tribes. Much of this cultural disintegration was caused by technology.