Shipwreck

Possibly, but I don't think it would make for a solid season. It's still a better idea than "Cruise Ship".

Magic Show

So... Freak Show, but slightly different? Yeah, that won't fly so well. We don't want a repeat of another season.

Opera Theatre

A lot of Opera theatre elements were also included in Freak Show. Also, that title doesn't scream the horror! like the general season titles. Roanoke being the exception since it is the name of a real place (though oddly named, because the season isn't even set in Roanoke).

Area 51

Now, this is something I would love to see - mainly because the incident at Roswell is a genuine American horror story. The conspiracies, the media-storm, the cultural impact that it has had ever since.

Orphanage

Wouldn't that just be like Asylum, but, for children?

Concentration Camp

Not set in America therefore not an American Horror Story. Also, they brought in elements of a concentration camp in Asylum.

Black Plague

That is a thing, not a place. Seasons are named after places.

Torture Chamber

Have you watched Asylum?! The entire season is littered with Torture chambers. Also, not a large enough theme to make an entire 10-12 episode season about. Also, it's an oddly specific name - like Bathroom, or Lounge Suite.

Disneyland

Could be very interesting, but would also be too similar to Freak Show. It would make for an interesting season on ACS, although I'm not sure what the season would be about (Disney's racist movies perhaps?)

Space

Again, not really an American horror story, but space-oriented could be neat.

Deep Sea

So, a horror show that is set in... Lots and lots of water?

Suicide Forest

I feel like that would be an element to include into a season, but nothing to make an entire season about.

Apocalypse

That would just defeat the purpose of the show, no?

Catacombs

AMERICAN. Horror. Story.