God, no, I hope not! I can't deal with another "... and then they woke up, and everything was normal" story. Once on Dallas was enough for me. :: wacko2
Now, a premise more like "The Matrix", where it's real because, well, it is real - to you, and to the world around you, because you're all caught up in the same persistent, simulated, world delusion.
I can buy WR&H having some wizard, somewhere, pulling something where the people of L.A. all think they've been sucked into hell. Or, the other way around - some wizard, somewhere, making the people of the world think everything's fine when they're actually all in hell, and in L.A. they've broken out of the "Matrix" and into the "real world". There's an Architect somewhere still feeding the Matrix-reality to the rest of the world, keeping the veil over it.
Another thought is that someone is feeding this "reality" directly into Angel's head, and he's actually trapped somewhere, living out this nightmare.
Ah, hell, I don't know. I've read only about half of ATF. It's hard to keep up with, hard to swallow, that book.