No state has ever repealed its direct-legislation provisions once enacted

Evidence

On the other hand, despite its failure to expand territorially, direct legislation has not withered and died. No state has ever repealed provisions for direct legislation, once enacted. Moreover, both the initiative and referendum continue to be used. Frequency of use varies greatly from one state to the next. The ballots in Maine and Colorado contain very few initiative or referendum proposals, whereas Oregon and California typically contain a fair number, some of which represent important legislation. — Henry M. Hart, Jr. and Albert M. Sacks, The Legal Process, 3538