Continuing to work out some ideas for Action Theater: In its current state (with the seats removed and some doorways punched through the center wall) the building could house a small dark ride similar to Boo Blasters on Boo Hill at Kings Dominion. Sally Dark Rides already has a number of options that fit into a 4,500-8,000 sq ft facility. Each theater measures to about 6,000 sq ft on Google Earth for a combined total of 12,000 sq ft. These smaller dark rides have about 14 scenes that are traversed by 10 four-passenger cars, depending on the size of the facility. The ride itself should be something that the whole family can do together, meaning no indoor coaster here. If Kings Island wanted something a little bigger and different than Phantom Theater: Opening Nightmare, there is space behind Action Theater for an addition that would increase its footprint to 30,000+ sq ft. The entire Enchanted Voyage building is approximately 30,000 sq ft and had an additional 2,500-ish sq ft for the outdoor section of the trough. I think an indoor boat ride would be the best option for this building addition scenario. If needed, the service road cut off by the addition could be re-routed to connect to the service road <100ft south of it. Unfortunately this project would probably require the removal of WindSeeker to give it a better entrance — similar to how the plaza existed before WindSeeker — but it could also work if further changes were made to the area. It could also be distinguished by not including interactive elements since those will be available in PT:ON.  As for the ride's theme, I've been going between a few ideas. They could go for a Coney Island/history of Cincinnati concept (though I worry about how Six Flags would handle the Coney name) where you board a small riverboat and proceed through scenes celebrating either Coney Island or Cincinnati. Another option would be to use a theme found in classic amusement parks, such as a Journey to the Center of the Earth ride, a ride with a catchy tune, or a pirate ride. The pirate theme would 100% work better at Cedar Point with their history. Kings Island will have the haunted house ride covered with PT:ON. I'd prefer to stay away from using an IP in Coney Mall (renamed Old Coney in my head-canon) so no Justice League, Looney Tunes, or Peanuts themes. A carnival or circus theme also feels inappropriate (I also don't like the circus theme for Coney Maul during Haunt).  The theme I've kept in the back of my head is a trolley-based theme tying back to the old trolley parks that were the precursors to modern amusement parks. Ohio has had a few of these throughout its history like Idora Park and Euclid Beach Park. Coney Island was more serviced by the riverboats than a trolley line, but the concept could work either way. 

SIX no longer exists.

My problem with a wild mouse isn't the coaster type, but rather how SIX (assuming they've kept the operating procedures of FUN) operates wild mice.  They stop them in the station instead of continuous movement and in some cases (looking at you DP) brake the crap out of them. 

^ Completely agree.  I love Exterminator at Kennywood and it is one of my favorite coasters there. A wild mouse in the Crypt building would be fantastic.