Who gives a shit? OxyContin is barely around anymore anyways, there are tons of IR Oxycodone formulated pills out there, and fuck shooting pills in the first place. If it really makes that much of an impact on people's supply for abuse, we will simply see a major upsurge in Heroin availability, as well as other pharms like Dilaudid, Morphine Sulfate, and Opana. I've never seen or even heard of anyone having Oxymorphone, so maybe we'll finally start seeing it around. I'd love to try that stuff out...
By far, the biggest downside to such an initiative is the inevitable fact that IV users will continue to inject OxyContin no matter what manufacturers do to it or how much they change it in the interest of deterring abuse. Subsequently, the adverse effects on health will begin to increase at an exponential rate, and the damage caused by doing so will become more and more severe.