The entrance area and the inside will still be a "culture of Norway" display. The ride Maelstrom, was an entertainment method that contained certain unexplained facets of Norway, but, hardly a history. It was there to basically draw people into the pavilion. Frozen has nothing to do with Norway, per say, but, does fit in there better then any other place I can think of. While all those people are waiting in line for that ride, they will unconsciously be learning about Norway where otherwise they might have skipped the whole area completely.
Try and separate the entertainment part from the "learning" part. When you do, you will find that it isn't all that terrible a thing to do. Maelstrom was cute, but, hardly a class A attraction. All we heard for years was how neglected it was. The polar bears were dirty and the displays had missing pieces. Hardly anyone really cared. It is really time to get over it. It's gone, it's not coming back and on a scale of 1 to 10 with 10 being the worst that could happen the loss of it is about a -1 on the importance level.