O/U on TEOTWWAWKI

So, against all the evidence to the contrary, the world didn't end today. Incredible. Who would've thought a world could outlive a calendar! The earliest I remember myself as a kid, I probably couldn't.
But nothing lasts forever. As conditions change, species rise and fall, and no civilization has yet scored anything that could be reasonably considered a long run. It will at some point end.

To help those of us subscribing to the strange theory that the endless abyss starting fifty miles from the edge of Suburbia isn't indeed infinite, and what could count as TEOTWAWKI by US standards may be just another rainy day by Somali ones, I added a qualifier "Western", forming the ultimate target event of TEOTWWAWKI.

So let's bring out our over/under lines on when it's going to happen!
And give your reasons please. It's what matters the most.

Hmm... I think the West is already in decline. I'd set the line at 225 years.