There's somewhere around 60 million kids in the US alone. Picking them up and dropping them off from school, soccer practice, ukulele lessons, birthday parties, etc. is a large amount of time as a parent. Ask anyone with kids if they'd buy a car that would take their kids to dance rehearsals on its own.

People will love these things, and they'll want to use them all the time, and the traffic will be horrendous.