The problem with engineering our way to a utopia, or at least, a humane government and economy, is determining who gets to write the specs that the engineers implement. It basically the same problem of deciding who should govern us, and how much of our own autonomy we should delegate to them. We're still going to have the same problems with a technocracy, that we already have with representative democracy.
http://www.openculture.com/2013/01/hannah_arendts_original_a...
I'd also argue it's something we need to actively work to engineer out of society and humanity.