I couple of years ago I saw these movie about The Venus Project and was very exited about it but after reading a couple of books (The Blank Slate, How the mind works) from Steven Pinker it seems to me that the main impediment for implementing a RBE as proposed by TVP is the fact they seem to be extremist in their belief that the environment can wholly explain human behavior, which I think is successfully proven incorrect by professor Pinker.
TVP proposes the abolition of certain institutions like money, governments, the judicial system on the ground that they are at the root of most if not all social issues. They seem to adhere to the "noble savage" doctrine and disregard some intrinsic features of human nature such as the propensity towards violent behavior, territoriality, xenophobia, etc.
What are other obstacles you can discern that would make this idea of engineering society impractical?
Since TVP tries to promote the use of science in order to achieve it's goals it would be best if those obstacles are backed up with factual data/references that can make it easier to argue with people about the true reasons such a project could not be implemented.