It's a haunting image - a far-off, nightmare-ish future, where almost all of your favorite X-Men characters are dead. But that could never happen in the real world, right? WRONG.
Instead of X-Men, it's Batman Beyond, Young Justice, and Avengers: Earth's Mightiest Heroes.
Instead of Sentinels, it's shortsighted network executives.
And instead of it being reversed with some time travel help, it's irreversible.