An interesting idea, but I think escape rooms might be too low-capacity for something like Citywalk? Unless they offered some sort of boutique experience that they could charge a premium for and limit to a select number of groups daily (by reservation, maybe? I don't know). Are escape rooms reaching the end of their interest to the GP or are they still a thing?
A highly themed arcade experience catering to all age levels could be a lot of fun, and quite successful. Nintendo has some experience with this.
Seeing something similar to some of the amazing arcade experiences in, say, Japan, could be interesting, and possibly be a unique addition to the CW2 skyline.