In Young Justice: Invasion (season two of the Young Justice television series), the superhero Impulse arrives from the future. It is revealed through his memories that the Reach has subjected humanity and, seemingly, the metahuman population. In order to prevent this future, Impulse travels back to the present in order to help the Justice League and Young Justice.
Based on what has been revealed from Impulse's memories and what was currently occurring during the television season, it is (more or less) easy to infer what happened to any organization in opposition to the Reach:
the Flash would have died, Blue Beetle and Green Beetle would still be under control of the Reach, six members of the Justice League would have been sentenced on Rimbor, and the remaining members of the Justice League and Young Justice would have been killed, subjected, or exiled.
But what happened to the Reach's partner: "The Light"?
Since they were partners with the Reach, it seems that they would have been shown privileges (or, at the very least, leniency) that other humans and metahumans would not have had.
Plus, "The Light" appears to always be several steps ahead of the Justice League and the Reach and always plans for "contingencies."