The initial process of making it would take time, but it wouldn't be something that takes a massive amount of time to install once it is done, and could be reused yearly. After the initial year, it wouldn't be anywhere near as much of an undertaking as the Halloween Hootenanny overlay for the Timber Mountain Log Ride or Haunted Mansion Holiday.
It wouldn't happen now though, since they waited too long and now Disney has the Simpsons rights.