Yeah, the concept doesn't "fit" with any theme park in the area. But I don't see a roller coaster on the side of the road doing good business. In a town where most of the tourists are already here for theme parks, why would they pay to go on one roller coaster? In Vegas, this model works because the primary draw is gambling and that's a restrictive activity. In Orlando, you've got an over-saturated market already. Why am I going to pay $15 (a fifth of the price it costs me to get into the theme park I'm more than likely there to visit) to ride one roller coaster? It's not like locals are going to be attracted to it, either. I mean, sure, some people, but again why would I pay $15 to ride ONE roller coaster when I have Annual Passes to the other parks (btw, this $15 number just comes from my experience with coaster charges in Vegas).
The whole thing just seems like a weird idea. If it's seriously going to be a standalone attraction, I think Orlando is the wrong place for it. It would be better suited in New York, Vegas, or even Wisconsin Dells. In my personal opinion.