A neat idea. But given that so many people with home wifi networks either can't or don't change it from an open to a secured access point, I can't see a whole lot of people outside of the enthusiast market going for this. And those that would be interested in a product like this can generally already accomplish what is described, even through the crappy firmwares on most routers much less flashing an alternative firmware to enable more options.
Then again, more power to these guys if they make it work.