I genuinely don’t understand why anyone wants a dark ride there. It would just be wonder mountain guardian 2.0 where it’s screens: the ride. Just can the volcano concept and build a quality coaster which is what people go to KD for.
Given that the mountain was originally constructed to house 2 dark rides and a flat ride, I would not rule out a dark ride as a future possibility.
As far as Canada's Wonderland Guardian ride, it is one of many dark ride variations. Neither of KD's former mountain dark rides were anything like Guardian. They were the closest thing to a Disney dark ride back then. I don't think any US regional theme park has come close to making something like the Lost World since it opened in 1979.