Before I found boondocking I was watching the Movement very closely. Most Tiny Homes are built with S&B materials rather than those that are lighter but require better engineering to avoid structural failure. This results in a THOW that is only mobile in the sense of a traditional mobile home, which isn't meant to be moved more than once or twice before you have issues.
The majority of the tiny homers on the videos have been primarily single male professionals (who are marketing to the TH movement) or young couples who don't have a kid - yet. I've watched the follow up videos where there's a kid in arms and they're talking about keeping the TH for an office or guests, but building a small home with more space for the growing family. The brave folks who are dedicatedly raising a family in a TH are few to non-existent. And the folks who try it and last only a year or two are legion. The whole 'Better Homes and Gardens' look is unrealistically artificial and I've seen it used on Airstream videos - those mod, clean interiors are NOT realistic and are only achievable with a level of COD I'm not up to!
The restrictions on parking a TH are what held me back from serious investigation. Heck it's held me back from embracing a Schoolie that I've practically been offered at cost!
If folks continue to flee S&B housing to mobile living, I foresee taxation of some sort, and I agree that I like my roads passable, my water potable, along with all the other amenities of a modern infrastructure.
