Kill or cure?

Apparently, scientists are now trying to cure cystic fibrosis using elements of the HIV and Ebola viruses. Hmm...I can't think of anything that can go wrong there. The trouble is that not enough credit is given to the enormous success in extending the lives of people with CF by more conventional means. Surely it would be better to build on this rather than attempting an "all or nothing" quest for glory - even if no Nobel Prize is forthcoming as a result.