if everyone was good then our next step would to become great- good then would not turn into bad but simply turn into not great. it'll be good but you know...it aint great ahaha no but if we all become good (that is whatever it is which you mean by good i'm assuming some highest form of morality where there is no bad actions as we see bad right now) then bad and good will disappear because good and bad actions only apply where there is some progress or loss of progress to be made. same would apply if everyone were to be "bad"- if there is simply one then there can be no other nawmeen? if there are variations of good then whatever, this is assuming that good actions are all equal in the sense of whatever the hell you are saying