Yes, most of the rides are 3D, but they can actually use that to their advantage in regards to a holiday overlay.
They can spend some cash just ONE year to create new holiday ride footage for Minion Mayhem and Simpsons, and then reuse it every holiday season, already paid off. This is Comcast and Universal we're talking about. I know it's expensive to create new footage, but it's a one time expense they can and should do. So much potential. It would be great for locals and tourists to see "limited time" overlays.
They have great facades to decorate. They should do the same with the rides inside.