This seems like a really good idea if you can convince innovators to come to the page. Not sure how you plan to do that. I like the way you promote the stories, and the diversity of stories you feature.
The idea is good, and should get some interesting responses. However, I thought that the implementation plan was quite limiting. Not all countries have reliable mail service, limiting this means of communication. The postcards only post questions in English, limiting them to English speakers. An online alternative could really broaden the reach and accessibility.