I should say, lest some think I am pessimistic, that I do beleive God will save some who are not traditional Catholics by conversion and repentance but I think this would be extraordinary and that those so saved are not saved in the normal way as traditional Catholics would be. So they do not have a good chance of being saved though they might get "lucky."
As Pius XII said they "cannot be secure about their salvation". This is because they do not have an infallible Church guiding them in truth or the Sacraments or the disciplinary guide of Catholic Church to help them along the way of salvation. Those within the Church by an effective desire may lose the Faith and or die in a state of Mortal sin.
Even members within the Church are without a visible shepherd having to depend on themselves or the traditional clergy in regards to controversial issues (settled - EENS/BOD and unsettled (Pope, una cuм etc.). Some do not have access to the Sacraments or deprive themselves of them because of the current state of the Church.