Last time commercial fishermen took the US to court, we lost badly. So what looks like a slam dunk, may not be.
Despite the righteousness of the fishermen's case,the USSC has an easy out. The will cite there is legislative relief available through the Congressional Review Act.
The supremes usually take a case, when they see a potential to overturn something.
If the law is clear, and the subject properly decided, there is no need for them to take the case.
So just the act of taking on a “settled law” is a signal that at least some of then do not like it.