The 49ers would consider moving to Santa Clara if plans for a new San Francisco stadium fall through, team and city officials said Tuesday. "If for whatever reason things don't work out in San Francisco, we need to have a backup," said Lisa Lang, vice president of communications for the 49ers. Team vice president and chief financial officer Larry MacNeil has met twice with Santa Clara city officials in the past month to discuss the option of building a stadium in the parking lot of the Great America amusement park, said Ron Garratt, Santa Clara's assistant city manager.