Yao Ming's expected retirement could diminish the NBA's once-burgeoning popularity in China, with many fans saying they would no longer watch games."What's the point of watching NBA now?" asked an online user called Lubingxia on Sina Weibo, a Chinese Twitter-like site.An online poll on Weibo by Monday lunchtime showed that 57 percent of respondents would stop watching the NBA after Yao's retirement.The 7-foot-6 center is expected to announce July 20 at a news conference that he's retiring from the NBA after nine seasons because of leg and foot injuries. Source: ESPN