People here don't care about the future, they just want to live forever. They think they are the end-all-be-all of life, that after them nobody younger needs be born.
Living forever is caring about the future. Just not caring about the future in the way you deem "right", or "true".
Also, wanting to live forever has nothing at all do with the birth, nor does it mean that birth can't occur anymore. How about you leave your doomsday straw-man out of this, please.
Countries like Japan have more deaths than births. The more advanced a society is, the closer the ratio of births/deaths is, so I'm not that worried.