Isn't the question still what happens when the gateway opens? 3D bodies could die en masse and then it could take a variable length of time for them each to decide what to do next, as per the above quotes from Ra.
However, the point about the non-harvestable entities 25,000 years ago is intriguing. The issue there, though, is the one Austin referred to: "all are harvested" this time.
However, the point about the non-harvestable entities 25,000 years ago is intriguing. The issue there, though, is the one Austin referred to: "all are harvested" this time.