It is firmly within the power of the Church to tell you to leave them behind when you enter the “real world” outside India. In exactly the same way the Ruthenians were told to leave behind ordination of Married men to the priesthood. In exactly the same way the Ukrainians were told to abandon their latinizations.
It’s a practice that’s never been approved of by Rome, merely tolerated by Rome as an artifact of the Indian culture that needed (and continues to need) accommodation, for it is a denial of the Unity of the Church to practice Endogamy within a subset of the Church.
If an individual chooses to restrict their choice of potential spouses on the grounds of ethnic or cultural basis, that’s one thing; it might even be a sin in itself, if the reasoning behind it is itself sinful (racial hatred, for example). It’s another for a diocese to enforce endogamy (as Kottayam does - the Kottayam diocese will not perform the wedding if it violates endogamy), but outside Kottayam (who was granted an exception to the Law), it is utterly reprehensible to expect the bishops to violate extant canon law which calls all Catholics equal before the Church without prejudice on the basis of race, ethnicity, or nationality.