Ex-Blair envoy gives Iraq warning

"The UK and US may have to abandon Iraq if central government breaks down and the country is engulfed by chaos, Tony Blair's former special envoy has said.
Sir Jeremy Greenstock said a pullout from Iraq might be needed if the US and UK had no "reasonable prospect of holding it together".

But he said he did not think this had happened yet."
BBC

We could always pull back to Kurdistan and let the other two side fight it out till they're tired of it. Not something I recommend or anything. But you have to keep you chips on the best bet.