Rabies.. ha. There are no documented cases since I last checked of a rabbit transmitting rabies to a human (or any other animal for that matter). There are tons of cats who have done this, though. And the cats at my parents house were more destructive than my rabbit has ever been. Not to mention they're both very clean animals.. they're only dirty if you don't clean their environment.
I think the shed is a good idea. To me outdoors is OUTDOORS in a hutch/pen. Outdoors can be very dangerous because of predators, constant stresses, and weather. It was 86 degrees in my APARTMENT today and my rabbits were having trouble with the heat. If they'd been out in a hutch, regardless of shade, they'd have died of heat exhaustion. Same goes for freezing to death in the winter. To me, a shed or barn is NOT outdoors. It is a shelter.. a scaled down version of a house which is "indoors". So long as it is temperature controlled in some way (fans in summer, heater in winter) it's basically the exact same thing as being indoors.. so I don't get the argument. I mean.. is there anyone here who even keeps their rabbits outside in a hutch alone?
I would never support this idea.. because wild animals have been known to injure rabbits THROUGH hutches.. or open them and get the rabbit out. I bet the rabbit I bagged at the animal hospital who was decapitated by another animal (pulled from his hutch at night) would beg to differ about the safety of outdoor rabbits. I also assume that the two rabbits who contracted rabies after being attacked by a raccoon through their cage would have been happier inside.
I assume that the rabbits who suffer from fly strike, bot flies, and maggots would prefer to be kept indoors.
My rabbits like attention on their own terms. I like being able to come home and relax after work and let my bunnies approach me when they feel like it. I wouldn't cage my rabbits indoors or out. I agree that no animal should be confined indoors its entire life, which is why in good weather my pets come outside with me to run around. I can't see sitting in my barn for hours after work, but I can see sitting in the living room, petting my bunnies as they ask for it, whether I'm watching TV, on the computer, or just hanging out with the buns.