The Big Ten (and its old running mate, the PCC/Pac-10, rip) has gone its own way many times in the past
Whether it was refusing to give pure athletic scholarships in the 1940s-50s, giving fewer scholarships than other schools in the 50s-60s, or declining to join the CFA 1978-1997, (the group that sued the NCAA for TV rights and won), the Big Ten's faculty and presidents have never shied away from this kind of action
Seems clear they believe the Protect Act is going to pass
The Big Ten has now adopted a rule limiting schools to a total of $49 million in institutional NIL/rev share support and a max of $27.5 million in school arranged third-party NIL agreements.
These are key components of PCSA and show conference is moving forward regardless.