I know this has been brought up before but it would be very hard to produce a good business case (which I have no doubt is needed for an investment of this size) for just adding more theming to Air. There is no way it would be marketable in a way to bring more guests and revenue to the park. Whether that is right or wrong is a totally different matter but it's something that was never going to happen.
I'm sure that Galactica will remain as it is next year. I am not so convinced that the VR will remain into 2018 though.