Where are you getting the 50% figure?
By all accounts, the park made this decision after looking at the customer data and where guests are spending their time within the park. I don't think the park made this decision lightly and removing the rides provides significant savings (although it's a hard pill to swallow). I'd hardly say they're "done for" by solely having the pool (which truly has been their bread & butter for years), water attractions, and yearly festivals.
Anecdotal: but I swung by yesterday just to snap some photos of the rides before they depart. People were enjoying them, but the "crowds" around the rides paled in comparison to the crowd at the pool and its line to get in. Hell, many of the people I saw actually enjoying the rides were donning amusement park t-shirts anyways.
A lot of people on these forums, like with Orion, need to realize just what little percentage "enthusiasts" make up of park guests/buying power.