RE: Is it time?
Why not? AMA has done essentially that at Muncie, providing an area set aside for for PFs to operate in while events are underway. Seems like a fine way to physically separate types of models that don't mix well at flying sites, like planks and helis, as no frequency coordination is needed. Wouldn't need to be separate clubs, but no legit reason it could not be, side-by-side.
Abel