The number of people who suffered fatal overdoses from oxycodone at the height of the original opioid epidemic were a fraction of the number dying now from fentanyl. Nobody (or practically nobody) prefers fent to oxycodone or heroin, if they had those on hand. Both have the benefit of a long history with extensive knowledge about their respective properties, both positive and negative. Such a solution ("omg, then people will be allowed to get high! Getting high represents a moral failing! oh noooooo"), while it would result in less lives being lost and would save quite a bit of money if done right, amounts to a symbolic "surrender" for the diseased minds of the prohibitionists, though, so I"m not holding out much hope for that