Kolo, a strong argument can be made that it it already has been so declared. (cf Casti Connubii, Pope Pius XI, 1932)
and if it were so declared, the people would reject it, as it appears from polls Roman Catholics have. In Orthodoxy, that would be the end of it.
Truth is not determined by majority vote. There was an undivided and undiluted Christian witness condemning birth control prior to 1930. That a majority of Catholics would reject it now demonstrates that apostasy is widespread, not that 1900 years of Christian witness prior to 1930 was wrong.
The GOANSA website even admits that approving contraception is an innovation, and they're okay with it.
“Truth is not determined by majority vote.”
No, of course not. But if the consensus of the People of God is that something proclaimed dogmatically by a council or a pope is not to be accepted and lived out, if the laity does not give its “AXIOS”, then whatever has been proclaimed is not dogma. It may be a true and/or good belief or practice, but its not dogma. The witness of the undivided Church was consistent on this until the Bishops of Rome came to believe that they could proclaim dogma sua sponte. I think the reaction of Roman Catholic lay people to the dogmatic prohibition on birth control by +Paul VI demonstrates the wisdom of the Eastern Rule since I would argue that the begining of “cafeteria” Catholicism really began with the laity’s rejection of that dogma and the insistence of the Roman Church that it was valid. What that has lead to is a sort of contempt for most all dogma which is not a good thing at all.