The last time they tried anything like an ARG, it was outsourced and barely advertised. So, that implies there is some desire, but not manpower. But it also highlights how there are much higher priorities.
I think an in-park ARG is counter to the direction of the event now. If a guest is playing the game, they’re clogging the park but not buying food. There’s no ROI in it, which is the priority. If the last attempt was successful (in increasing spend), it would still be happening (and expanding).