There can't be a significant net decrease in number of households unless housing is sitting empty. There could be a net decrease in population if the people arriving are younger than the people leaving, and don't have kids yet. But that doesn't seem a sign of decline.<p>Similarly, there could well be a shortage of U-Haul trucks if the people arriving are young ones with no more than a car full of possessions, and the people leaving are older ones who've accumulated lots of stuff. But that doesn't seem a sign of decline either.