Nitro was very original at the time, and when you think about it it still technically is unique because the next nearest B&M hyper (I said B&M specifically because Skyrush is a whole 'nother monster altogether) is Apollo's Chariot I believe, which is 5 hours or so away. El Toro is of course unique, but remember that there are a few of the Prefabs overseas. Kingda Ka... yeah, it's extremely similar to TTD, and that's it. Those are the only 2 rides in that category, so it's not really that bad. Plus, they're 9 hours apart. With GL the second half of the layout is far different to Rougarou's, with Rougarou having the more intense and compact second half (NOT a good thing with standup trains) and GL having the more spread out version. Scream and Bizarro are at the opposite ends of the country, plus it's not really too similar to TDK... more elements, different layout, though I see what you're saying. Most B&M layouts/elements are very similar.
Even if Gadv got something unique for 2017, I really think some other park would get something similar and it would no longer be that unique.