Macau (Reuters) - On Macau's dusty Cotai strip, the cranes at the Las Vegas Sands' construction site stand idle at dusk atop the half-finished husks of three massive towers, while weary batches of construction workers, laid-off en masse, stream out of the site's turnstiles, many for the last time. After a golden streak since 2002, which saw Macau transformed from a sleepy former Portuguese colonial backwater into a Las Vegas-style gambling paradise, Macau's luck may be running out.