Yes, I agree. Many of these options seem to be improvements on rides currently operating in the park.
Hyper Coaster- Morgan Superman
300-400 foot drop tower - Kilimanjaro
Xtreme Spinner- Joker (a bit of a stretch)
DC Themed Launched Coaster (Inverted)- Batman the Ride SLC
The only truly novel option would be the glider. This survey leads me to believe that the park may be looking to remove an existing ride to replace it with an upgraded version. Honestly if the town gave so much pushback on the proposed tilt coaster, I'm surprised they are looking to add such large options.
It is interesting to me to think that Six Flags is polling a DC themed ride. Perhaps they are wondering how much pull a theme like that has. However, in order to do a truly controlled survey, they should have just polled the coaster style without a theme as the theme may influence a participant's choice. Likewise they should do a separate survey solely about new themes for rides to get an idea for what theme is most appealing.
While I have been to Mexico twice to see Our Lady of Guadalupe, I have not been to this park. Depending on what type of ride they get next, I may have to make a third trip to Mexico!