More preparators would *always* make a difference. Here in Australia fossils are pulled out of the ground at a much faster rate than they can be prepared, meaning that a decade might go by before an important specimen is even recognised (let alone described).
Not just in Australia!!! Like several others of present company, I have personally seen the unopened crates in the Bone Basement of the natural-history museum in Berlin (not accessible to the general public). Unopened crates from the Tendaguru expeditions, from before the _first_ world war. They're _not_ there for decoration.