From what I read, perhaps the 2 worlds have been there for a long time, but FATE lost full control of HOME WORLD since 10 years ago.
And for over 10,000 years,
FATE has been watching over and
guiding the descendants of the
staff who left this research center.
Everything was in pefect harmony.
That is, until 14 years ago,
when a boy came into contact with
the Flame on the night of the storm.
FATE has been manipulating the
world of El Nido, in order to
avoid any major change to the
history it knows.
If an event on El Nido
influences the main continent,
the year 2400, in which FATE
exists, would change.
This paradox could potentially
lead to great disaster...
An instruction to the young girl
in Arni 01 to give up going to
the main continent as a poet.
An instruction to the man in
Arni 02 to give up becoming
a fisherman.
A plan to avoid any point of
contact with the main continent,
so as not to affect history.
However...
Ever since the formation of
the Dead Sea 10 years ago...
FATE has been unable to intervene
directly with World 01.
The best FATE could do was cross
the dimension and receive data
through the Records of Fate.
And with much difficulty, FATE
succeeded in binding Miguel
to the Dead Sea as a watchman...
It's been a while since I read that quote from the Computer, and I find it very interesting when looked at with Lucca's quote above. FATE is fine until Serge contacts the Flame. That doesn't cause a problem because Wazuki is able to kill Serge six years later. However, when Kid saves him, FATE loses contact with Home World. It's interesting that FATE doesn't lose contact with either world when Serge touches the Flame, only after he is saved by Kid. Why is this?
Maybe that was FATE's only chance at killing Serge. We know that, in the future of Home World, FATE tries to kill Serge and fails. So, after he is saved, Serge is sure to live out his life in Home World. His Arbiter status locks FATE out of the Home World Flame, and it can no longer manipulate Home World. Therefore, citizens from El Nido have contact with the Main Continent, and all hell breaks loose like the Computer says above. Can it really be that simple?