I've recently read an article by Ethan Siegel over at Forbes (he also blogs at Starts with a Bang) on asymptotically safe gravity as a possible alternative to string theory. I read the author's blog from time to time, and he's described the potential benefits of asymptotically safe gravity, as well as the apparent prediction of a 126 GeV Higgs Boson years ago.
My question is, what sorts of challenges does this idea face when it comes to quantum gravity? I feel like the buzz generated by an extremely accurate Higgs prediction, coupled with the ability to avoid adding entities like extra dimensions and supersymmetric particles, would be a huge positive in favor of asymptotically safe gravity. That being said, I do see much written on the subject and I wonder if that might be related to inherent problems or skepticism in relation to the framework.