The idea is that following their defeat, they alongside the rest of the fallen angels would be imprisoned for a thousand years then let out to test the integrity of the people who have known Jesus' kindness and love under his rule.
Those that do fall prey the temptation despite knowing better would end up consigned to oblivion alongside him. No eternal torture in the underworld but nothingness. So in that respect, there will still be an ebb and flow to the evil in the world. There is also nothing stopping further humans or angels from committing another exodus in their hubris.
Angels were supposed to be pure beings without free will and yet the events of the old testament still played out as they did.
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