Can't be patented, so no drug company can have exclusive rights to it. They would all make it and it would immediately be driven closer and closer to "at cost" pricing. There's no profit to be made in curing a patient, only in extending their life while maintaining the disease.
Edit: Not saying the article is correct or anything, simply that were this the case, there would be no incentive for a Pharm. company to bother mass producing a cure for cancer, AIDs, or anything else really.