Is the question limited to stackoverflow?, or all their mirrors?
Stackoverflow biggest value is its archive of knowledge much more than the ability to ask new ones.
So if it disappears, all the various mirrors that has a copy of all the question and answers (which stack overflow publishes as a DB dump), will just fill the void.
From then on, new sites will take its place (like dev.to) for questions to be asked.
If it includes mirrors - i will call it the work of magician or aliens!
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