It seems like every museum in America has expanded in the past few years. But is all this growing sustainable? Is it warranted? Eric Gibson: “Every business sector goes through cycles, and there’s no reason to believe museums are an exception. Instead of continuing to assume visitorship will grow indefinitely and that they should build accordingly, their officers should begin to imagine a future where demand slackens, as people find other ways to replenish themselves. It may already be here.”