The fairest thing would for the cost of manufacturing alone to be reimbursed, but again I think this should be paid by Uncle Sam.
That's the dream scenario for the drug makers also. If Medicare ends up covering the cost then they can charge the taxpayers (us) anything they want without having to fight the insurers. Who's going to enforce price controls, the congressmen they've bought and paid for?
I think it's incredibly foolish to allow drug companies to start marketing products without any proof-of-efficacy requirements at all. The terminal disease medications market might start looking just like the "supplements" market very soon.