In every other conflict throughout history people have moved. No one ever moves back. Certainly not until long after peace has been made. Israel wont the war and Jews moved back home to Israel and are still moving home. Some never left. Some have been home for centuries. Others for less than 100 years.
Russia: U.S. plan to provide air cover for Syrian rebels undermines Damascus fight on ISIS (Reuters)
from the article: Arab leaders rule out amending Saudi proposal