Sorry but don’t see where do you get that the bible says the world goes out like a lamb or piecemeal? I dont see that. It goes wooosh in very large increments when God finally says he has had enough during the tribulation, then gets an “extreme makeover” after it because of all the destruction so we have a NEW heaven and NEW earth.
I also don’t agree that Obama is a prophet - not according to bible standards. I don’t give him that much credit. He is simply a pawn who is being used by Satan, just like every other TWO BIT TYRANT, to bring about his destructive plan. Which I do agree—occurs as you say. Gradually.
That said, Obama is a perfect foreshadowing of the antichrist and I would not rule him out as a candidate because the antichrist starts out as just a charismatic figure who then become endued by Satan. It is Satan that gives him his power.