USD/CNY passing 7.0 shows that China is going to fight this trade war hard, at least while President Trump is in office. There is a chance, in the medium term, that the yuan could weaken further if:
1. The trade war escalates even further and the Chinese government uses the yuan to create market volatility. This could be a tool to frustrate Trump's 2020 re-election campaign.
2. The Chinese government has a plan to compensate for the loss of economic activity caused by the trade war. Asset market turmoil, led by a far weaker yuan, may not hurt China so much as it hurts the US.