I remember Vin Lewis in one of his talks said that on the last day of the world it was possible that those not validly baptized will be baptized. He theorized that as long as time remains, there is an oppurtunity to recieve the sacraments.
In a separate note, I remember reading the life of Dr. Simone Weil, she was a Jewess in France, had a PhD in Philosophy, and she died in 1943. She once said that the reason she did into enter the Catholic Church was because of the dogma Extra Eccesiam Nulla Salus. She felt that she knew some "good hearted Jews who must be in heaven too." This is just emotional hogwash!
Once again, Brownson in his 1874 article on Extra Ecclesiam says on positive/negative vincible/invincible ignorance:
“But they who are merely negative infidels, or unbelievers purely through ignorance, in consequence of never having heard about the Gospel, are not guilty of the sin of infidelity? Certainly not. Every Catholic is presumed to know that the 68th proposition of Baius, Infidelitas pure negativa in his, quibus Christus non est praedicatus, peccatum est, 'Purely negative infidelity in those among whom Christ has not been preached, is a sin,' is a condemned proposition, and therefore that purely negative infidelity in those to whom Christ has not been preached is inculpable – as St. Augustine teaches, the penalty of sin, not sin itself. But who therefore concludes that they are in the way of salvation, or that they can be saved without becoming living members of the body of our Lord? ‘Infidels of this sort,’ says St. Thomas, ‘are damned, indeed, for other sins which without faith cannot be remitted, but they are not damned for the sin of infidelity. Whence the Lord says, “If I had not come and spoken to them, they would not have sin”; that is, as St. Augustine explains it, would not have the sin of not believing in Christ.’ There is a considerable distance between being free from the formal sin of infidelity, and being in the way of salvation. No infidel, positive or negative, in vincible or invincible ignorance, can be saved; ‘for without faith it is impossible to please God,’ and ‘he that believeth not shall be damned,’ and faith in voto not in re, is inconceivable. Neither of the subdivisions of the unbelieving class of our countrymen are, then, in the way of salvation."
("Extra Ecclesiam Nulla Salus," April 1874, Brownson's Quarterly Review)