PoB deployments should be final.
They should only be considered, if the development changes affect the base's location, like the way it is now. Moving Pobs around every 6 months would just be abusable in terms of getting your PoBs out of the harm's way.
Sometimes finding the location of the PoBs you are chasing can take up to multiple months to get acquainted with the routes suppliers take, and the names they use and which might constantly change, so it could be harming the overall gameplay.
If anything, PoB moves should be ridiculously expensive, like 4Billions, or like 1000 Sci-Data, or more, depending on the distance it needs to be moved.