Something like this would be like a culture attack in Civilization. It would show that something better was possible and not an ocean away, completely destabilizing the status quo. I am not surprised so many African leaders denied it - they would not try something that has such a high risk of eroding their power base and the iron hold hold they have over the path of revenue.
Will this work? Well it either will or it won't. If it doesn't then things are no worse beyond a few bitter people. And if it does? The implications extend beyond Poor countries if the richer ones all of a sudden have to start competing for the flow of talent. If they run slightly different versions in different areas they can even do some optimization on the best features of an economy and government. I can't see this as anything other than a good thing.
But your last paragraph ... Ouch. I had to rewrite this post three times to keep it civil. I guess your point is you think this idea is just that good, but if you take a step back and consider that on the one hand we have a very, simple, proven, and cheap way of saving huge numbers of lives and on the other we have something very ambitious but as yet unproven, you might conclude that they should not be competing for the same dollar.
Really, it's a choice between the near certainty of saving a life and the possibility that one could save many more. It beats donating to the Society for Curing Rare Diseases in Cute Puppies.
From a utilitarian perspective, there's zero proven benefit to sending charity to first world people playing utopia.
If this model works, and more countries see it working and adopt it, it's an incremental path to trustworthy courts and healthy entrepreneurial environments for dozens of poor countries around the world. That's what it takes to end extreme poverty, and now there's a new contending path to it. If this model works, Paul Romer and Patri Friedman could be the new Norman Borlaugs.
I seriously think that anyone currently sending money to Africa for insecticide-treated mosquito nets (previously Givewell's top recommendation for efficient philanthropy) should consider switching to sending money to this instead, from a utilitarian perspective.