Well, if we’re just speculating things, they could just move all of Hogsmeade twenty yards to the west and get more space as well.
The IoA property is defined by the perimeter road. It use to be structured (and
@Alicia can probably confirm if it still is) so that Studios, IoA, and CityWalk were three different PROPERTIES with unique, definitive property lines. It was likely designed that way to avoid compounding taxes (if one area posted a profit and the posted a loss, for example). They were ostensibly, separate businesses and it’s why permits will have different addresses based on where work is happening.
That said, any expansion of either park beyond their perimeter is a big deal. The IoA ops building is part of IoA’s perimeter but everything else for that park is inside the perimeter road. Redrawing of property lines (even lines you own) has to go through city/county review, approval, and tax reappraisal. It won’t happen.