If there wasn't a demand for infills, there would be no infills. It is a huge miss that for everyone of these proposals it is made out to be the big bad developer versus homesteader just trying to make a better life for their family. In reality, these are homes or people, some shoeboxes but some places for families too (see the maps of toddlers in the inner-city SW).
Could a developer put out a call to their existing residents and ask them to speak about living in one of their properties? Why not, the people that would live in these developments aren't ghosts and goblins, they're people.