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I think the bigger issue is that I have two children, and I know sticking them in one seat belt is unsafe, no matter how smart the air bag is. I just found it odd that you would say that it's the perfect car for a single parent, when the majority of single parents I know have more than one child.
It still looks like an interesting car, but I think efficient cars that more than 2 people can fit in have a much bigger impact on the environment, due to the much bigger market. Not that environmental impact seems to be the main point of this car, with only 33 MPG, and then only if you are really careful.