Four-man crew

[Kansas Ref]

Was just at a camp over the wknd, a clinician told us that currently under experimentation / consideration is the use of a four man crew--yes 4 refs on the floor during a game. The reasons this clinician proffered were: 1) to employ more refs for games, 2) to improve floor coverage.
Are 8 eyes better than 6 eyes? Are 6 eyes better than 4 eyes?
Presumably this would apply to upper level games of college and pro.