Jews are not isfet. Isfet is not something that resides in a group, a race, or an object; it is part of the universe. To eliminate isfet, you must eliminate the universe itself.
Jews “embody” this primordial energy; they are instruments of isfet. Once the enemy's power is removed, Jews will not suddenly disappear into thin air, nor will the Greys, but they will be “sealed.”
Ammit will then do his job, and they will be “devoured.”
This indicates that, in a hypothetical situation where our enemies suddenly disappeared from every plane of existence in a single day, isfet would still exist, because, as written above, it is not limited to them.
Ra fights eternally against Aphopis, not for a long time, but eternally. This also invalidates the question of ages, being cyclical and not fixed, as Hesiod describes.
The Gods and Demons cannot be compared to human beings; their understanding and management of Isfet is obviously functional.