How would they put a G-fighter lift in there? With the train tracks underneath and the way the stairs are built into the structure there's no room to work with. I bet it'd be cheaper and better to tear it down and just build a new tower for the purposes of hiding a lift.
Then again, what do I know - but it seems more and more like they don't actually have a plan for the tower. To me it looks like they had to get rid of the Waterboggin sooner than they planned due to some sort of liability or maintainence issue. The tower might be standing simply because there's no need to spend the money on bringing in a crane to remove it. OR, the waterboggin reached the end of it's planned maintainence life and the park had planned to have a new ride in it's place by now, but the 2009 delay has pushed everything back a year...
Hmm, it all still seems weird to me. I'm still trying to see why Splash Harbor and the Waterboggin were removed when they were.