For those wondering about the likelihood of future Section 421 (China specific safeguard) determinations, here's an interesting tidbit about the cost of filing such complaints, from The Hill:
The cost of preparing, filing and arguing the complaint the United Steelworkers union filed against China is relatively inexpensive, according to experts in the field.
Legal fees for most cases will run well under $1 million, according to a K Street source with experience on the filings. The safeguard case could cost as little as $750,000.