I'm a bit nervous about doing this. At the moment, I've got the possibility of paying $2k/month or dying. If we mess with a system that's clearly working, will

I'm a bit nervous about doing this. At the moment, I've got the possibility of paying $2k/month or dying. If we mess with a system that's clearly working, will I continue to have the choice of paying $2k/month? For Gleevec, almost surely yes. But what about other undiscovered drugs?