I disagree with one point on the video: at least in the suburbs I've lived in (various places in the South SF Bay Area, and Los Angeles), you could bike places. And I regularly did starting around 8 years old. I would regularly ride up to 4 miles out. And you could retrofit many of these suburbs to be more bike safe.

I think the far larger problem is cultural. It doesn't matter how safe bicycling is if there's a chance for your children to be taken away from you for letting them take advantage of it. That is also why my wife is hesitant about this stuff.