One of the many considerations when any park talks expansion is the infrastructure. There are a whole lot of issues to consider when planning out an expansion or new attraction that the public never considers... utilities, drainage, run off, etc. Every square foot of land you cover creates a whole new series of engineering challenges lol. Central Florida is wet! You dig a hole, you get water. Thus the utilidor concept. Planning for where to route your storm drains isn't as easy as just routing it to the nearest body of water - most states require you to control storm drains (or have a way to isolate them) to protect the environment from a HAZMAT incident, like a fuel spill or run off from a large loss fire.
At the amusement park I worked at, the park was situated on land classified as wetlands... and for every square foot of wetlands developed on the property, they were required to buy 2 square feet of wetlands elsewhere and set it aside as protected.
Sometimes it makes sense to remove existing attractions whose footprint no longer justifies their use, practicality, or cost. And it gives them an opportunity to update existing infrastructure in an area that may be way outdated. There are a lot of costs associated with an expansion vs re-purposing existing space. Additional maintenance, additional staffing, additional wardrobes, where are these new employees coming from? Where are the going to park? Is the current employee support departments able to handle the additional staffing? Space is just part of the equation.
