Returning to Earth can actually happen in Alpha Centauri, if only in one of the epilogues:
Epilogue
^ The cold-sleep unit finally cycles open and you stretch muscles rusty from
decades of computer-managed disuse. But they are young muscles, shockingly young,
and it will be a pleasure to beat them back into shape. Orbital insertion
begins and you tingle with the excitement of your new mission and with the joy
of having returned to human form. Yes, you left a copy of your personality among the
Planetmind's giant matrix, but this copy, this human being $NAME1 now waking to
lead the first Seed mission, this is the only self now immediate to you and therefore
the only real you. You are flesh again, and so quite mortal, and for this too you
rejoice.
^ You despaired when Planet invited $NAME5 to join its dominant self, and
for a decade or more you moped about the bizarre virtual reality of the Undermind
with no coherent purpose, a lost spirit unable to die. But when the Seed missions
began, the Voice/Planet personality herself sought you out in the abyss and convinced
you to accept command of the {Prodigal Son}.
^ "Earth$NAME3, you are unfulfilled here and I have need of you. In ages to come
I shall have need of allies, sister Minds, if I am to keep the flame of conscious
thought from guttering out as the universe contracts or else expands to dust. Take
with you the gift of life, the seeds of all our species. Spread them to the stars,
across the galaxies, creating new civilizations, new minds, and enlisting the aid
of any you encounter. Go forth, Earth$NAME3. Go forth and multiply."
^ The maneuver at last complete, the safety shutters retract from the viewport
and you behold a sight lost to human eyes for over $NUM3 centuries. Deep blues, swirling
whites, the azure tint of a rich oxygen atmosphere. Inviting browns and greens of
continents basking in the sun, a few scattered impact craters the only visible signs of
a war now buried in the aeons. Third planet. Earth. Home.
What a beautiful way to lose a game.
What is wrong with some people?
