China is a member of the WTO. It's subject to more anti-dumping provisions than any other country. The dispute mechanism of the WTO is not working because the United States refuses to name judges to it. That's a problem that has to be dealt with. China actually acts in many ways within the rules of the WTO. We do need the WTO. We do need to be on that.
The premise of your question is a little strange in some sense. Either we're a trading nation or we're not. When you're a trading nation, you're, in that sense, automatically vulnerable to changes in trade flows. Unless we decide to go the way of North Korea to autarky, we have no choice but to be subject to those vulnerabilities.