In't that always the story with these kinds of discoveries?
Sounds kind of like the discovery of sulfa drugs, it may or may not pan out but one must keep looking to find the next good tool to fight various types of infection.
Personally I prefer to wait until they have finished testing.
It only works against Gram positive bacteria. And we have no idea what it does to people. All we know is that Teixobactin is effective in killing gram-positive superbugs and that so far it isn’t toxic to mice. We don’t know if it carcinogenic to them. In fact, we don’t know if it causes long term damage to mice not noticeable yet. We have no idea what it does to primates and people. I don’t even know if they have tested Teixobactin in a human blood culture yet.