Casino kingpin struggling as gamblers stay away from Las Vegas. "If there's less traffic, then you make less money. Period." Wynn Resorts' stock down 49% since October high. Plans to unveil $2.3 billion Encore resort behind his $2.7 billion Wynn Las Vegas casino later this year. Still winning in China. Opened $1.1 billion Wynn Macau casino resort 2006; sales up 50% in second quarter of this year. U. of Pennsylvania grad started out at Frontier Hotel. Bought Golden Nugget, built Mirage and Bellagio resorts. Sold Mirage to Kirk Kerkorian for $6.6 billion 2000.