If it still works, it won't be going anywhere.
Several massive reasons as to why, the most realistic are...
The pit it lies in is a tricky bugger, it's really not much use for anything else and would take a hell of a lot to fill or level out for something new to fit in.
That area isn't a. Kid friendly zone other than this ride. Lets say your typical family of four are walking round mum dad 15 yr old Tommy and 8 yr Lucy, whatever, they won't want to split, I've seen I loads of times. The Blade is the best filer ride for kids of young ages to go n so the family don't have to split up whilst older kids and parents are queuing for Air, Nemesis or Ripsaw.
"Life is a waste of time, and time is a waste of life. Get wasted all the time, and you'll have the time of your life!”