rather than this type of roundabout financing, the economics can be straightforward: school districts in wealthy areas should just pay their teachers more. and it sounds like they are, at least in some districts, according to co-founder jra6 elsewhere on this page: "...educators in Mountain View are paid reasonably well ($80,000 - $130,000)...".
even so, the idea that teacher homeownership is the central problem for schools is quite a stretch. poverty and a dozen similar issues are much more likely the central problems for schools, not teacher homeownership.