[+/-] AIDS cure via gene therapy?

According to the BBC, the National Institute for Medical Research has isolated a gene in rhesus monkeys that makes them immune to HIV:

Scientists say... [t]hey have pinpointed crucial differences in a gene found in rhesus monkeys that can prevent HIV infection, and its human counterpart, that cannot.

It appears that only a single change to the human gene is needed to enable it to block HIV infection.

The scientists say their work indicates that HIV would not have become established in the human population if mankind carried the same version of the gene found in rhesus monkeys.