In reply to mattgc2: Don't listen to these guys, they evidently have not been there recently. The place is very dangerous now, I was there last week and a storm has washed away most of the rock supporting the stack. The council were there attaching emergency steel cables to hold it up while they do a more permanent number on the base.
I don't think they would want you climbing on it in such a condition. Guess it would be a few weeks at the minimum to properly shore it up.
Personally I'd just let it fall over but the tourist industry probably see it as a symbol they have to try and save.