It would, but people start panicking because they don't want their six year old standing alone on a deserted street corner in the dark waiting for a school bus. Seattle changed it to do that last year, but honestly what the fuck makes sense about a 7am school start time for anyone? In Australia I didn't know anyone who started school before 8.30am, ever. And that start time was basically consistent for 12 years of schooling, public, private, elementary, high school, whatever. It is like discovering aliens to see how the US school system is arranged.
6 year olds don't stand alone waiting for the bus anymore, there's always a parent waiting with them even though it's safer today than when we waited outside by ourselves. Even 9-10 year olds commonly have parents waiting with them.