World population is down to a few billion or so. Nobody has any need to travel anywhere anymore. Humans aren't reproducing because they never meet anybody to reproduce with - they never go anywhere and cyber sex satisfies most reproduction 'urges'. A gleam in daddy's eye leads only to a session with the ThrustMaster, a huge cyber bill, and no offspring. People get out of the habit of meeting other people in the flesh and feel uncomfortable in the presence of live humans.
Robots satisfy most physical needs.
The end of civilization as we know it looms. Issac Asimov mentioned some of these ideas in I, Robot and I see the tools needed to actually make this scenario come true being developed surprisingly quickly right now. The mind boggles. Corp. All Rights Reserved.