Just remember that you will be signing a contract under Saudi Arabian Law with a x day termination clause, so if they do start to get enough crews to fly on the permanent contracts, economic logic dictates that the 6/3 roster period and the crews who were hired under these terms will disappear.
Mutt makes an interesting point here but can an airline like NAS attract enough full time employees that are happy to live permanently in KSA? The bulk of the guys in NAS at the moment do it for the fact they don't need to move to the ME and can still spend time at home. So without this incentive then will RUH just be one big parking lot for the many aircraft that NAS has on order? I somehow think that is a very likely scenario if they get rid of the 'commuting' contracts!