In the reality of Kingdom Come, the most veteran heroes followed the example of Superman, who choose stay away from manking leaving a new breed of more violent vigilantes and metahumans "protect" the society.
Green Lantern built a giant space satellite supported by his power ring, to watch the space, keeping his atention towards any menace than could come from the outer space. But for many years, no threat came from the stars.
When Superman returned, New Oa became the Justice League headquarters and refugee.
After the events of the second Kansas Disaster, New Oa became a independent nation and joined to the UN.
New Oa also was seen as part of a dream sequence lived by Kyle Rayner during the Midsummer nightmare crisis.