Here is a short piece published by the C. D. Howe Institute, 24 May 2017, suggesting some options for Canada in NAFTA negotiations if the US demands removal of the existing binational panel system (in Chapter 19) for dumping and subsidy cases.
While not advocating that Canada should give in, the article suggests how State-to-State mechanisms in NAFTA Chapter 20 could be re-jigged to provide a possible and effective alternative.