The AI could probably make use of something like
"begin the game with all ancient ruins revealed"
More vision quest than great expanse.
On the way people play...
If the default option is wrong, it should be changed by congress supermajority vote.
(I wonder how many people play with events on?

)
But if this is like 50/50, maybe it is better just to remove and replace with something else.
Having said that, new balance to ruins might change the ratio.
(btw am I right in thinking ruins don't DC multiplayer games anymore?)