We have been there with my son (handicapped) and I can say you can not make it to most of the island. We had to park his stroller and carry him around a good portion of the area. So ADA should not be an excuse. They in fact told us while we can go across in the raft with his stroller that we would not be able to get the stroller around many areas. So they did warn us in advance and this did not bother us. Actually, I am trying to think.... I don't think we were able to get the stroller to the fort itself. I remember sitting on the chair with him resting because I was tired from carrying him around.
I am just curious how a tunnel that has existed since the park opened is now considered too unsafe. I could understand it starting to cave in (would also say this should have been caught earlier and fixed earlier), but to now say lighting is an issue? I mean they have haunted house with no lighting and no one considers them unsafe. The size issue you would also think would be an issue from the beginning also, yet I do understand as a country we are getting bigger. But a simple warning sign saying the area and small and for those that do not like to be in small cramped spaces, don't use this tunnel. It can be worded and themed in a way that would not be bad. This was the part of the fort the kids seemed to like the best, so to take it away from the kids just seems wrong.
It is not something I do a lot, but I think it is a shame when I see a part of the park so neglected and not being refreshed or updated. Basically no love for the island from Disney.