The end of the world is always a few decades away. Always, close enough to scare the gullible but far enough away that the scammers have ample time to cash in on it.
I agree with you that the doomsdayers abound and are often rather nutty. But for believers the Bible does make it clear there will be a return of Christ and and “end” of this world as we know it anyway. Personally I’m inclined to believe the predictions of those who lived in old times. They were intelligent and held firm beliefs unlike the nutjobs of today who wait for their alien ships and such. Or the evangelists on TV who want you to send them money to “reach the masses” before it all ends in a blaze of fire.