Two very interesting comments.
HIV infection may well be cured in our lifetime. It’s also likely at least one vaccine will become available. A very occasional patient may have naturally occurring antibodies against HIV - such antibodies are good for studying experimental vaccines.
As for " cures for many cancers " and " what mother nature may have planned for us next ", those are topics for a whole new thread ( see http://bit.ly/1XVcXqM ).