^No, I've also been bugged about that plot being empty, ever since Drachen Fire was no longer there!
As one of those (apparently few) people who loved the coaster, and didn't think the roughness (even with the removed corkscrew) merited its removal, I've lamented its lack of existence for years now, and the lack of anything directly replacing it has been a bit of a sore spot too. However, I think I've heard that there are some issues with the neighbors in the area back there putting up a stink about noise, which has probably led to the lack of anything new there. However, I'm still holding out hope for a B&M Floorless Drachen Fire tribute coaster back there, and choosing to believe that's why they haven't put anything else there!
Another issue that could explain it, is that one of the stated reasons for Drachen Fire's closure is that it had low ridership numbers since it was a bit out of the way (it really was - though not on the level of The Bat at KI or Thunderbird at HW). So they may be gunshy about putting anything else there, unless they build up that entire area alongside it.