It's a great buzz idea. I wish for our work (NGO) there that this could be a viable solution to the "last 100km problem."
But...the solution isn't scalable in any significant way (cost, training, support) and while he has identified the need for support as the key factor, I didn't see a viable solution.
That's why there are so many people interested in cellular networks and tools - check out mPESA in Kenya - 13 million people sending > $400million per month using SMS micropayments. Now there's a solution that was well thought out and that scaled well.