Many of the Bahraini's were not leaving period. They made a lot of noise (can't blame them) about leaving and I know several who said that if GF did not met the competition they would leave. They are still here.
At this point GF is trying to keep its experienced expats, FO's and young Bahraini's (some of who are decising whether GF is a good future career).
As Tbay said - the other issues overwhelm many and corruption in all areas, especially rostering/planning, are still not solved. With the loss of SG and JM rostering will get even worse. To the point, imo, if you are not a connected habibi you will work like a slave with little chance of the plums in the sked.