I dunno, my big concern with this is that, as far as I can tell, the mutation makes it so that the white blood cells don't grow these CCR5 things. I don't know how well science understands what exactly they do, though, and I feel like there is a lot of potential for a lot of other things to go wrong if they don't extensively test this to make sure it isn't potentially worse.
Yeah, this kind of got me thinking... we need to destroy this virus, not find a way to make it not work on us. It will evolve, and the only way of knowing for sure that we've assessed the problem is to get rid of it completely.
I mean this is a step in the right direction and I'll always welcome that, but we need to get rid of HIV permanently.