I'm at a utility company flight dept. Department has been around more than 30yrs when I came 10 years ago it felt more secure than a government job. Just today all the pilots were talking about concerns that the department doesn't feel secure right now due to some changing circumstances out of our control. If the business model changes the need for the department may change.
I think there is always a possibility for things to change quickly at a corporate dept and you need to be ready for the next move. If they are not in the business of flying airplanes, the expense has to be justified all the time. There you are a little at the mercy of the flight department manager as to whether or not he is good explaining all the tangible and non-tangible benefits of the department to the decision makers.