Cost of labor, materials, equipment etc. have risen since the original system was built, but also improvement and lessons learned on efficient / safe operation have evolved. The guests / fans like it and use it. Expanded access to different venues (include the water parks in the new loop). Less traffic on the roads and a regular more efficient movement for guests to different points. In short costs vs benefits, simply put, the benefits far outweigh the costs. Less penny wise and pound-foolish thinking.