At risk of having vegetables thrown at me, I must agree with Swoosh. Though I have memories of the treehouse, I can't say it had a nostalgic effect on me. I liked aspects of it, but never considered it anything special. In fact, I think my favorite part was the narrow spiral stairs that led up the trunk. I don't mind that it's still there, but I think they could point it out more and at least decorate it for Christmas.
It would be interesting to see some of the actual pieces from inside show up in HDH, but I seriously doubt they would match the decor.