it all depends on technology usage i think
when you read as much as i do about
miniaturization of electronics....
development of nano technology particularly
carbon based materials ten to twenty times stronger than steel
and much lighter by a long shot...
it's going to change everything....
but it'll take a large combination of new battery
and power storage... technology
some that hasn't even been invented yet
leaving the ground ...is the main thing...
no more rolling around on rubber tires
....in the future that will be as laughable
then as a "horse and buggy" is to us now with modern advances
at the present stage of Automobiles ....is today.
