Ah yes, a theme park. The way all cities become great, like:
Jackson, NJ
Eureka, MO
Austell, GA
Gurnee, IL
Agawam, MA
Most of these Six Flags, etc places are closing, the rest are losing money. And you're not going to get a significant stream of people to one when you're only a couple hours from Orlando.
And have you guys ever been to one that wasn't run by Disney? They are, on a good day, pretty pathetic places. I like roller coasters as much as the next person, but this would not help this city. They can barely keep one afloat that is an hour from Philadelphia and New York.