I actually fail to see what is really that new with this
Reading is one thing, comprehending is another. For the first time, we know what can get rid of this very bad bug in a mammal, without using the previously accepted (and not at all controversial) fecal transplant when other antibiotics fail.
Mouse or not, this gives a target to look for in humans. And assuming all of the ingredients are human-compatible, this should result in a good step towards curing a very painful and debilitating condition.
The principle has been known for a while, but the exact mix that works for this particular bug has not been known. Hopefully you see where the big deal is now. Previous treatments offered certain strains which only succeeded under certain circumstances, most likely when the patient had some of the missing flora.
I won't address the rant, it is a blend of ignorance, well-trodden fact, incomplete understanding, internal inconsistency, and a few others that can't be specified because they are wrapped around other fallacies. If you indeed can read, you should read less mainstream media, and certainly quit reading slashdot comments.