@Afghani84: You can already play a dead civ. It's fairly difficult to achieve, at least consistently, as in most cases you get a struggling civ instead. I believe vjek has some dead civs up the sleeve in the world gen cookbook thread (and I'm playing one right now).
A dead civ has the following characteristics:
- You get your 7 starting dwarves, plus two waves of migrants. That's it (not counting recruited visitors and gremlins).
- Your civ won't send caravans or a liaison.
- You won't get a monarch, nor any civ appointed nobles, but you will get a mayor when the pop has increased enough.
- You won't get insulted by the pointy ears demanding you to stop removing the unsightly starvation inducing trees (the noble they need to meet is never appointed). However, human and elven caravans behave normally otherwise.
- There can occasionally exist other dwarves in the world, but normally they're hostile necromancers. I haven't encountered a case where any dwarves were members of other civs, but it might be possible.
The only know sure sign of a civ being truly dead is to embark, look at the 'c'iv screen and find it completely empty (normally you start with the dwarven civ there). No dwarf in existence for 1000 years is NOT a sufficient criterion.
Unfortunately, burned is misinformed. The message is the same both for a truly dead civ and for a "struggling" one. A struggling civ provides a caravan and a liaison, and you're likely to be saddled with an emergency monarch selection early on. You'll also get an unlimited number of migrant waves.