Many have pointed out that tiny houses aren't for everyone: families with kids might come to mind, for example, though we have seen more than a few instances of average-sized families adjusting to the tiny life, whether on wheels or otherwise.
There's also the possibility of just using two tiny houses together, as tiny house builder Viva Collectiv has done with The Ohana. It's basically two tiny homes connected in the middle by an open sun room and deck (and was apparently featured on Tiny House Nation).
According to commenters over at Tiny House Talk, this compound of two tinys is home to a family with kids. As you can see from the photos, it appears that the parents' bedroom, kitchen and bathroom is situated in one tiny house. The hallway here that goes around the bathroom makes the space seem small, though, and it might have made more sense to switch the placement of the bathroom and kitchen in the interest of keeping the common areas opening out onto the sheltered outdoor space.
This is a gorgeous bathroom with impressive tiling!
The sun room and deck in the middle is a clever idea, extending the useable space between the two buildings, and connecting them spatially. It's too bad that it's not screened off, though -- depending on the location, bugs and cold weather may limit its use year-round. But it's nevertheless a plausible solution to the "too-tiny" problem.
Meanwhile, on the other side, the kids have a sleeping loft upstairs in the other tiny house (not pictured, unfortunately). This secondary tiny structure is where the family has their sitting room as well, in addition to the kids' playroom.
Living on a tiny footprint may seem extreme and radical to many. But at probably around 400 square feet, this home could be considered 'small' rather than 'tiny', and as some have pointed out, countering the negative environmental and social impacts of the "bigger is better" myth may require the radical approach that the tiny house movement advocates. In the end, it may be about finding that middle ground, where more sustainable housing is of a small rather than tiny size, where the big revolution happens. More at Viva Collectiv.