It isn't speculation; it is a theoretical question, and you're already wasting time by replying.
I'm aware what Hindu's believe, when compared to their texts; just the same as every other religious tradition in this current world that go contrary.
Kalki Purana 1:3 May the Supreme Personality of Godhead, having assumed the form of Kalki, who is the Supersoul of all living entities, establish the eternal principles of religion Having appeared in a family of brdhmanas, He will annihilate the sinful kings of Kali-yuga by the fire of the poison emanating from His ferocious serpent-like hands while riding on the back of an excellent horse of the Sindh province. In this way, He will protect the pious and re-establish Satya-yuga
Kalki Purana 2:28 The four exalted brahmanas offered their obeisances unto Lord Visnu, who had assumed the form of a human being. They very well understood that Lord Kalki had appeared to rid the earth of all those who had become degraded to the level of sinful demons.
As stating previously on here, that most Hindu's do not accept we're the demons according to chapter 16 of the Bhaghavad Gita, and we're not Brahman unless we're a saint already.
Repeatedly your lack of taking on board what is being stated properly is shocking, for someone who seems so smart...
The OP doesn't say anything about the afterlife; Judgement day according to most religious texts happens here, where this realm is cleansed by fire, and after those who are Godly live in this realm, the rest are removed.
Yet the OP is theoretical as well, to make us ponder what sort of response we would give in said situation.
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Not filling in any of those questions, it could be any religious requirements, some have made it, we haven't...
Thus the question was left open to see if people ponder how they would appeal, and how many argue against the concept.
Tho the start of your answer would make a good appeal; the end isn't rational based on the idea presented, it is happening, we don't have a choice if it happens, we're either removed from reality or come up with some way to appeal.
In my opinion.