The "tiny house" market seems to be seized up on by those with a mindset of making a profit as landlords in b&b schemes, and as "second homes", and others have focused on basic structures "for the homeless" (which they certainly can be and should be also).
I would say that it's not just the "less fortunate, homeless, and/or disabled", but also highly necessary for a great number of people, for the purposes of drastically lowering our impact on the ecosystems of earth. 1/