Nope, nothing anyone says makes the case final, especially when they are wrong:
More recently, Greenspan's reputation has faltered along with the world economy, and hindsight-assisted evidence suggests that he turned a deaf ear to warnings of the housing and stock market bubbles that exploded after he left the Fed in 2006. In House hearings during the second month of the market meltdown of 2008, Greenspan testified that he had "found a flaw" in his market ideology, and conceded that he had been "partially" wrong in opposing regulation of derivatives.