They could be easily assimilated throughout the other 20 or so Arab countries in the region. Because lets face it, they will probably never retrieve thier lost land (assuming it was theirs in the first place). And it would be a good chance for the greater Arab world to show how much they loved their brothers and how really peace loving they are.
Australia's most dangerous Islamic State operative killed in U.S. strike (AP)
from the article: Comment / Settlement freeze is like racial segregation in U.S.