Imagine, if you will, that they _enclosed the sides_ of the steel support structure. This would have cost a lot more money, yes, but they probably would have gone for it if it was meant to be a permanent structure. They may have even opted for a 3D look to the arm and the wand.
What we had was a cheap metal tower with what appears from a distance to be "plywood cutouts" of Mickey's disembodied arm on the front and back of it.
Contrast this with the "Hat" at MGM - they obviously spent some time and money on it, because it doesn't look "temporary." There's no visible "structure" in it. It's fully 3D--it looks like a real-life version of a cartoon representation of a hat. Whether you like it or not, it's designed to stay up for a very, very long time.
This is Disney, if they build things permanently they look finished. Disney doesn't, as a rule, put naked steel towers next to timeless masterpieces.