I like the idea, however, I feel this is a "napster" style idea. Allow me to explain..
Such a product would be dependent on it's community. If it doesn't have enough people using it, then it's not very functional. If enough people use it, then it would work very well. If it got to that point then everyone is going to start using it which could cut into the earning of governments around the nation. Then it becomes outlawed. The user base disappears. You're back at square one.
I say go for it.. make sure you get venture capital money before it becomes illegal.