Finding easier and cheaper ways to set GCPs will continue to be tested. UAVs are here to stay and are being utilized by more and more surveying and engineering companies each day.
If you haven't yet implemented a UAV program into your surveying business, you probably have thought about it.
The first six books in my "Survey Mapping Made Simple" book series should answer most of your questions and concerns.
Reliable and accurate results can be obtained from a UAV with the right camera and flying techniques.