Cuba v/s Brave New World

Why, when we think about the future, do we always imagine flying cars, Brave New Worlds, highly medicated people, robots, electronic body substitutions, we will never be able to go so far, our environment will crash before then. Instead of highly chemically made drugs we are going to head back and seek for medicine plants and insects. Not being able to support ourselves with cars and boats and planes, we'll have hand made bicycles. Milk will come from cows again, not from plastic bottles. Who want a sweet cockroach for dessert?