It's really only wild because if the rumor is true, there was no official notice given. To think the tallest coaster in the world can just close suddenly without warning is ludicrous and short-sighted.
Otherwise, I absolutely can understand why they'd want to get rid of it. It's a pain to maintain and expensive to run (reportedly requiring a 24/7 maintenance crew to keep it running). The ride won't even be the tallest in the world anymore once the ride in Saudi Arabia is up and running and it lost its speed record long ago. The new SF bosses are looking to cut costs, and their attempt to redo Top Thrill Dragster into something more workable has blown up in their face. So I can very much understand them wanting to bow out of that mess and put something in there that will be more reliable and less maintenance intensive.
If the rumors are true and Green Lantern is out at the same time, it's even more crazy, though really I can't defend Green Lantern as an experience on any level and thus can't say I'll miss it.
