Been wondering this myself. It's like they've totally forgotten.
In some classic Six Flags Magic Mountain irony, the project is supposedly being held up by permitting issues.
I don't know why the park can't seem to figure out permits, but Justice League, Crazanity, and WCR (the station) have all been held up by permitting issues. Even the Aftermath 2 maze in the back of the park was held up for the same reason and was never actually seen to completion.
I don't think it is so much the park as it is the bureaucratic nightmare building anything in CA is.
Does any of the bureaucratic nightmare of building in California have to do with earthquake standards, or completely unrelated?
Somehow, construction across CA and in theme parks is still booming.
If it's permitting, I suspect it is 100% a money thing---not hiring competent people to get the job done going with the lowest bidders.