There's a world of difference between proposing, believing, suggesting, threatening, hoping, and actually doing it.

The best solution is for all foreign troops to leave ASAP
3 consequences:
The Iraqis are rid of foreign troops and the situation gets a lot better. Everybody breathes again.

The Iraqis go through a civil war but think they can deal with it on their own: fine.

The Iraqis go through a civil war and ask for the UN.
The Security Council members decide on sending troops to stop the violence in Iraq. That would be its sole mandate; not to force the country to be what we want it to be.

Raoul