We have stayed at POFQ our last few stays at WDW and when you take the boat to Downtown Disney you float right by them. Well anyway this last trip we had a very talkative boat driver and he told us that Disney had to stop using them when the Handicap assessable law went into affect and they had a problem refitting them, so they were empty for a long while but recently they started using them to house the students/workers that come from other countries to work for Disney
ctc917
Even though handicapped access gets mentioned by bus and drivers about the Treehouses, that's not why they were closed.
If they had to make any handicapped accessible, it would be a very small number. And, there are a lot of 'loopholes' in the ADA law - for example, there is no requirement to upgrade if it's not 'technically feasible.
There is a formula for the number of units in a hotel/resort that need to be accessible. I think there were between 50 and 75 Treehouses. By the formula, that would mean only 3-4 need to be accessible - and only one would have to be fully accessible with a roll in shower. The others would be required to have tubs with grab bars and a raised seat toilet. The main problem would be getting from ground level to the main level on the second floor, but there are ways to make them accessible without a lot of cost; including things like putting in a lift to go up to the outdoor porch level.
They may also be exempt because of being only 2 stories and each building being a self contained villa. Even in new construction, buildings 2 stories and under are exempt from needing elevators.
One of the big reasons I heard for them closing is the difficulty they had with cleaning. Housekeeping had to travel (and cart equipment/supplies) between all those individual treehouses. That is not a very efficient way to run a resort.
So, there are probably many reasons why they closed, but handicapped accessibility would not have been the reason.