Scientists remove HIV-1 from genome of human immune cells

Some interesting discussion on /r/science, I liked this one;

"If you had a CRISPR that worked in vivo and that fast it wouldn't just be the cure for HIV, it would be the holy grail of genetics. You could edit anything, genetic diseases, you could insert anything, and remove it later, adding traits like sickle cell factor to cure malaria then removing it later. Theoretically you could even use it to overwrite damaged genetic code with the original copy, meaning you're a little telomere-altering from immortality... Somehow, though, I think it won't be quite so easy."

Is this a big deal? I can't tell whether it's a big deal. I hope it's a big deal!