So yea I'm just curious to see what people would do in such a scenario

Let's say the destruction of the earth is inevitable, there is absolutely nothing that can be done to save anything/anyone.
Ideally I would like people to consider separate variations of the same idea, like say the world is ending in 3 days, 1 month, 5 years, 20 years (Even in the case where world end is in 20 years, nothing can be done, no technological advancement/miracle will be able to save anyone). What will you do? How will your life change (if at all)?
In fact, world will end soon or later, it's not scenario but real fact.
It's promised in the Revelation that this evil world will come to the end and that new world will come, without pain, evil, tears, death etc.
I waiting for this end of the world and preparing myself through reading Bible, prayers, living for the sake of others etc.
Yes, destruction of the earth is inevitable, but not destruction of the earth or planet but destruction of the evil and selfishness.
I'm already preparing for it, for the kingdom of Jesus when he come again and when our lives will really change a lot, because we will live in the God's kingdom o the earth, New Jerusalem.
So, it's not bad thing that this world will collapse but very good thing. It's new beginning.