So, turn roads into closed train tracks? That will take even longer than creating a true AI... people drive cars, people cross roads, stuff gets on roads, there are so many vehicles some do break down... What you suggest would lead to self-driving cars turning most roads into endless traffic jams.
That sounds like speculation. But anyway, there's no reason to open the floodgates in an unprincipled way just because being principled and iterative is challenging.
