I assume from your post you are not Catholic. One needs to understand the infallibility issue which comes from the teaching Magisterium of the Church comprised of the College of Bishops and the Holy Father. (If you want to understand, look to Catholic Answers publications for the correct church teaching.) A Pontifical Commission alone, does not hold the supreme and full authority of the Catholic Chuch. There are dissidents, even deep within the institution, but it is absolutely not possible for the Church to change her teaching. Although doctrine can develop over time, but it is important to remember that it must always go in the same vein, and along the same lines as previous church teaching. What has been declared infallible teaching, will always remain so. (There is a distinction between human disciplines which can change, and dogma, so don’t get confused.) Will the Church experience a schism in the near future due to the heretics? imho only, I think it quite possible.