I will admit at first reading this my thoughts were something along the lines of spending billions on something that one of your selling points is proximity to RV parking....good luck.
But from reading this thread, it got me thinking can a park like this, even if not this particular one, be successful.
For the most part, I have seen successful theme parks run on basically 2 different models. You have your Six Flags/Hershey Park/Sesame Place type parks. Single or Two day type parks, they serve as local, or regionally based attractions. Generally more ride (and coaster at that) focused, not as many dark water rides or show based entertainment. Many, especially those in the North East are not open year round, and operate on a lower prices/lower cost basis.
Then you have your destination type theme parks, Disney/Universal/Ect. Larger operations drawing from a nation/international pool of guests. Full year operations, appealing to larger cross section of riders, offering shows/dark rides/coasters. Unlike regional parks drawing on cross marketing with IP related content.
This suggested Midwest type park seems to be somewhere in the middle. A large single park (large as MK I believe they said) which likely has it bigger than most regional offerings, but not on the scale of Universal or WDW complexes as a whole. They didn't mention anything about operations but while not North East winters, its not the temperate environments of FL or CA, so i don't know how full year operations will look. While i agree the fly over area of the US has more people and money than the coasters may realize, and that the drivability to this part may induce alot of travel from the heartland to this park, maybe even in lieu of heading to the east or west cost for cost/political reasons i won't get into, I find it hard to believe that your going to get alot of east/west coast people, let along European and/or South American visitors to say, instead of FL or CA lets fly to Oklahoma this year.
So is there a market for a middle ground style theme park offering. Larger than a local park but smaller than a national/international draw? Can you support a higher overhead/operation cost and full or close to full year operations, on less volume of attendance and at reduced pricing? From an industry standpoint is there a market for this type of park, or do you end up with something that is either too big or too small to succeed?