VANCOUVER, July 8 : After Vancouver's final World Cup match at a packed BC Place on Tuesday capped weeks of sold-out crowds and city-wide soccer fever, attention is turning to whether the showpiece tournament can help secure the long-term future of the Vancouver Whitecaps.The Major League Soccer club face an uncertain future as ownership seeks a buyer amid longstanding concerns over revenue and the team's tenancy at provincially owned BC Place. In April, a U.S.-based group formally expressed interest in relocating the franchise to Las Vegas.Yet for supporters fighting to keep the Whitecaps in Vancouver, the World Cup has provided new evidence of the city's appetite for elite soccer."A team should never be moved anyway, but especially from a city that's hosting a World Cup," Vancouver South