Valhalla is apparently going to be SBNO for 2020, not sure on whether this is true but a true shame. Apparently it needs 900k in renovations and obviously has the high running costs as it is.https://www.youtube.com/watch?v=toQTgwYYtNU
I loved Valhalla, it was one of my favorite rides as a child when it opened, the water tunnel, the electric room, actually feeling cold in the ice-room, and so many real flames... but that was years ago, under a different management, and with every-year parts have disappeared until it became mostly just dark rooms. If it's a shadow of its past self and it's not financially viable to run it at full effect then isn't perhaps retheming it better than no ride at all?
I wouldn't be surprised if we see this happening more and more to effect heavy dark rides like these. Pharoah's Fury here in Lotte World used to have real fire and other effects and they've all been switched out for fakes or projections (a boulder rolling towards the car is now just a projection of a swirl)