It won’t be long before Turkey invades from the north and takes over Lebanon, booting out Hizbolla and then taking the Shiite and Alawite areas of Syria (western). ISIS will take eastern Syria and the Suni parts of Iraq. Iraq and Syria will cease to exist. Then war with Iran.
To be perfectly fair, Iraq, Syria and Lebanon are artificial creations with artificial boundaries established 100 years ago by Euro powers for their own purposes. Of course, so are most former colonies in Africa, etc.
No rational reason such boundaries should be considered sacred for all time.