That's not what yesterday's statement from the National Internet Finance Association of China (NIFA) indicated. They are a national self-regulatory agency created by the PBOC. They stated that the next regulatory step is not only to emphasize the prohibition on ICOs, but to strengthen regulatory supervision of cryptocurrency exchanges. It's not clear from their statement whether exchanges would need to close while applying for the proper licenses. But it does seem clear that there is no intention to permanently shut down the exchanges.
See here: https://news.bitcoin.com/chinese-bitcoin-exchanges-may-face-stricter-regulation-and-licensure/