The idea that the Pope claims to be able to do no wrong is one which lingers in the minds of many casual observers, but that is a misleadingly broad perception
Why do you think that "liberals" would reject the sanctity of human life? The Catholic Church has developed its position on various issues over the centuries e.g. slavery, Galileo, freedom of religion, democracy, the rights of workers, Mass in the vernacular language etc. It is perfectly possible that a future Pope will infallibly declare that Ordinatio sacerdotalis was mistaken.
Abortion and euthanasia seem to be popular liberal causes, the former in particular. I think unwinding an explicit infallible declaration would be difficult, a category into which none of those falls in a post-1870 understanding.
Why do you think that "liberals" would reject the sanctity of human life? The Catholic Church has developed its position on various issues over the centuries e.g. slavery, Galileo, freedom of religion, democracy, the rights of workers, Mass in the vernacular language etc. It is perfectly possible that a future Pope will infallibly declare that Ordinatio sacerdotalis was mistaken.
Abortion and euthanasia seem to be popular liberal causes, the former in particular. I think unwinding an explicit infallible declaration would be difficult, a category into which none of those falls in a post-1870 understanding.