I stayed in the tree houses in the 80's with my mom, stepdad (who recently passed away) and my 2 brothers. It was truly the most awesome vacation, and at my stepdads service my brother gave a speech and brought up some happy memories involving the treehouses. I am extremely nostalgic about them, and was so happy to go past them on the ride to DTD from POR last fall (2 months after he died). I hope they never get rid of them, and if they do refurbish them and offer them to guests as accomidations, I would be the first in line to stay in one!
I heard about the handicap accessibility being an issue, but also that they can't make them handicap accessible due to some environmental laws about construction... not sure exactly what was meant by that, but hopefully they will be restored to their previous level.