um, where would you have these people live?
Anywhere ,as long as it does not spoil your view of abandoned farmland, or a stand of trees?
I have news for you. People live in apartments, too. Big buildings full of 3 or 4 room units, your boundary wall is someone else's also. These same people will live in "pleasant valley" subdivisions just as easily, and you don't have to listen to the noise of the neighbor banging his GF at 3 AM (unless, you're, like, into that).
These folks you are complaining about are moving out of cities to get away from bad schools, and to get to where the jobs are. Yeah, its called SPRAWL. But ever since Mr. Levi built his town on Long Island, its been an intermediate stop for folks looking for something better. Once the kids are gone, these folks will sell to the next generation and move out to Montana (if Ted Turner hasn't bought every last acre of it by then).
Did you think that once YOU moved out to the edge of suburbia, that it would just stop growing out of respect for your aesthetics?