Ethics: Boomerang Kids

We typically think of adult children who return home to live with their parents as a bad thing, and it's certainly been a concern for a lot of people in this culture. But in the grand scheme of things, is this really a good thing or a bad thing when all the factors are considered? Would you want to be one? Would you want your kids to return home to live with you? What about the grandkids?

Links:
10 Boomerang kids who clashed with their parents (funny compilation)