But honestly how many times is one person going to need the cure for HIV?
The problem is more that the construct is basically the same for every virus to be targeted. So you take it to treat HIV, hepititis, pandemic flu etc. And when you use it to treat one of these you probably aren't becoming immune to the disease in question so someone might get HIV a second/third time (because some people are idiots). However, sensitivity might develop the second or third time it is used for anything. HIV is sort of a special case though since it suppresses the immune system. Humoral response would be B-cells but they might not activate properly with the T-cells wiped out. Anyhow, this is all hypothetical. Actually getting these proteins into cells in a human is a lot harder than getting them into cells on a plate.
A bug in the code is worth two in the documentation.