There are a lot of environmental groups that hate the idea. There was a big controversy over the replacement of a historic 3 sided shelter in the Olympics. I believe the environmental groups carried the day and now there is no shelter where there had been one for years.
It's really too bad. In my view a hut in a popular area would concentrate the human use, so instead of there being 50 tent platforms and poop everywhere it would all be confined to one spot.
I support environmental causes, but IMO the groups have a bias towards keeping everybody out. After all humans come from outer space and aren't a part of nature.