They will return some maybe not all, but they will probably have Goku ask Zen to fix it and because they love Goku they will. If not they got dragon balls to bad Oolong is not around to intercept and wish for an even better set of panties from the super dragon ball. Maybe they all remain dead and Freeza gets to be the hero by killing Goku for his selfishness and dooming universes so he could get some practice fighting.