"Suffice it to say that a large swath of manufacturers in coastal provinces such as Guangdong, Zhejiang, and Jiangsu has not been able to attract and retain workers."
Actually what is happening is these regions never had a surplus in unskilled labourers. They were depended on migrant labour and since 2011 the government has put strict limits on the migrant labour. Limits much lower than demand. By 2016 migrant labour is to be stopped to major cities in these provinces. It is all part of the current 5 year plan. The desire of the government is to get low value manufacturing out of these regions. As it believes the economy has develop beyond the need to depend on such manufacturing. This is an intentional move. It is not due to a change in worker attitude or slowing economy.
http://en.wikipedia.org/wiki/Five-year_plans_of_the_People%2...