Would management even be aware of how many apply, Doubt it.....but that's a pretty big vote of disapproval for JQ.
Management would know exactly who has applied and at the end of the day will restrict the flow of pilots to mainline if required. As long as the schedule is being flown they really don't care if you are happy or not at JQ.
If you want to receive mainline pay and conditions then apply to mainline. If you don't want to be an F/O or S/O for a long period of time then stay with JQ. Simple choices with long term career ramifications.