This brings out the thin line between treatment and cure! Whereas normally treatment should lead to cure, it is not the case for most viral infections! However as to whether a particular viral treatment will lead to cure will largely be dependent on the particular virus in question and it's mode of pathogenicity
I think the treatment of viral diseases as any disease depends on many factors which I summarize in the patient's status and aggressiveness of the disease. For many viral diseases there is no right antiviral but to date we can develop for each individual specific CD4 and make a personalized medicine. This personalized medicine may overcome the lack of an adequate antiviral disease.