Doesn't sound like he plans to sue:
"Unlike many other religious-freedom cases pursued by the group, Weinstein said he does not plan to file a third-party inspector general's complaint on the issue. “We’re satisfied that this will be taken care of,” Weinstein said, adding that his foundation seeks an admission of wrongdoing and an apology from Monken, as well as assurances that the coach will adjust his postgame ritual."
Staffers proudly and publicly posted a video of an explicitly religious ritual taking place after the game at a public institution where students also happen to be employees. This pretty clearly indicates that no one thought there was anything the least bit strange or inappropriate about it. Why would you be skeptical that of the thousands of people to then see it and share it -- and the resulting attention, which was sought by the very people and system now being looked into -- some folks would come forward to acknowledge that, yes, it upset them or made them uncomfortable.
Calling attention to it, asking for it to be acknowledged as a misstep, and making adjustments so that it's no longer a part of the post-game ritual seems like a pretty reasonable response, one that is specifically non-litigious.
Invoking the shadow of 'political correctness' doesn't advance the conversation. No one's being raked over any coals. West Point is investigating, they'll likely come back quickly and say "this shouldn't take place," a generic apology will be made, and he'll stop leading his athletes in collective prayer (because really, why should he?).
Why is that a bad process or outcome? It seems like the coach made a mistake -- almost certainly one borne out of personal habit or meaning -- and the public response to that mistake is effectively highlighting that it's something he shouldn't do under the banner of public authority.