I think tiny houses are interesting, and I probably could live in some of them, but I don't know how much of a savings it actually is. A lot of the Tumbleweed houses are $60K+. In the South you can do better than that and end up with more house, though it might be less trendy and not up to date out of the box.
If I just needed temporary housing, I'd skip the tiny houses and just get a single wide trailer. Not stylish, but cheap with plenty of creature comforts.
I might be inclined to build/buy a tiny house for a limited use cabin or something, but spending $60K on ~500 sq ft. just doesn't add up down here. Maybe in some places, but not here.
It's definitely a neat concept though. I only want as much house as I need and can get use out of. I'd rather have a small house and a large shop/detached garage building than I would have a large house with an attached, normal size garage.