It is likely to be a long while before movie downloading becomes a significant challenge to the DVD rental business, NetFlix CFO Barry McCarthy told an investment conference in San Francisco Wednesday. "There are 100 million DVD players in U.S. households," McCarthy told the Thomas Weisel Partners Technology, Telecom & Internet Conference. "If you really think people are going to stop renting DVDs, you need to lie down until that thought passes." As reported by Video Business magazine on its website, McCarthy also suggested that Netflix may raise the price of its rentals for high-definition discs if those who rent them begin to represent a significant factor in online rentals.