It's a shame that falsehoods like these are still being propagated, forty years after the Council closed. Bl. John XXIII would never have countenanced the discontinuance of Latin. Here, in fact, are the very words of this holy Pontiff:
With the foregoing considerations in mind, to which We have given careful thought, We now, in the full consciousness of Our Office and in virtue of Our authority, decree and command the following:1. Bishops and superiors-general of religious orders shall take pains to ensure that in their seminaries and in their schools where adolescents are trained for the priesthood, all shall studiously observe the Apostolic See's decision in this matter and obey these Our prescriptions most carefully.
2. In the exercise of their paternal care they shall be on their guard lest anyone under their jurisdiction, eager for revolutionary changes, writes against the use of Latin in the teaching of the higher sacred studies or in the liturgy, or through prejudice makes light of the Holy See's will in this regard or interprets it falsely. (Apostolic Constitution Veterum Sapientia, 22 February, 1962)