New Jersey could nearly double its casino revenue taxes by legalizing Internet gambling, Gov. Chris Christie says. But the state also will be one of the country’s first to offer gambling in casinos as well as online, making some nervous about what to expect. “It’s so new and unproven that it’s a flip of a coin,” said Ed Spotts, a hospitality industry veteran who works as an instructor at Temple’s School of Tourism and Hospitality Management. “There’s no model. We’re going through uncharted territory here.”