It's true, hovering over the runway excludes others from using it for take-offs and landings. This is not a problem until it gets busy at the field. You should not expect anyone to sit-it-out while you practice 3D.

Our club has been able to manage well. The 3D guys take the field and everyone else takes a break. Usually this doesn't take up too much flying time for the other 90% of the club.