Infallibility is definitely a topic that we have to talk about. We might, for instance, want to ponder whether V1 was a free council? If not, a case can be made for questioning its conclusions. We might want to talk about how non-conciliar understandings of infallibility are at the very heart and core of the phenomenon of the modern Catholic Church being split rather violently into traditionalists and progressives at all levels. We might want to talk about how Ratzinger abused the concept of "ordinary magisterium" to draw the false conclusion that it is infallibly true that we may not ordain women priests. 

This is an awful lot to talk about here, most of it in one way or another implying that V1's definition of papal infallibility is beyond doubt one of the most fooling things bishops in council have ever done.