If they wanted to sell the park to the 49'ers, they should gut the park of it's rides first, and save them some capitol from buying new rides for their other parks. The big coasters at Worlds of fun don't have this luxury, if they were moved to other Cedar Fair parks, the support structure would have to be completely redesigned to fit the topography (most of the other parks have fairly flat land to build on).
What I'm assuming, based off that report, is that Cedar Fair is worried about losing money on Worlds of Fun and ValleyFair in the future. Not that they aren't profitable, just that they are too close to being potential failures; in other words: Potential Risk. Worlds of Fun has seen a decrease in travel to the park (cities like Omaha, Wichita, Des Moines, St. Louis, ect), while seeing an increase in Kansas City area business. In Macro business, this can cause a problem if you are trying to steal business, or create new business from an extended market. From this viewpoint, the park could only grow so large with the income coming in from just local sources, and not tourism.
It could really help these parks to build a record breaker, but then you would have to spend the capitol, and potentially not bring in the customers.