There’s still an opportunity when the report comes out. I agree, though, I don’t think they’re going to. I suspect it has to do with the feds breaking the train worker strike a couple months ago, which was already a pretty severe political own-goal - I think you’re right, they’re hoping people stop talking about trains.
The consensus among "progressive media" seems to be that they don't want to set a precedent where they do actionable change after a crisis. This could hurt them with their donors in future incidents so their strategy is to somehow get people move on from this. Maybe it will be continued media blackout or something dumb will be coming that will take up the news cycle(eg. Chinese Balloons). It is infuriating especially after they were given a lifeline by their voters in the midterms. Its a never ending clown show with both the left and the right.