Paul this has already happened.
1/ Modernism believes that religious knowledge emanates from the individual. This knowledge arises from within as a subjective impulse of the conscience or subconscious. All religions, therefore, are more or less good and praiseworthy since they all, in different ways, manifest and signify mans inborn religious instinct. There are thus as many different understandings of God as there are men. All these various notions of truth and of the divine deserve respect, for they are all legitimate expressions of the human spirit. Through mutual dialogue, different religious come to understand and respect one another, and this in turn promotes healthy peace and compromise.
Catholicism, on the other hand, teaches that it is the one true religion revealed directly by God. Only the Catholic faith can bring lasting happiness and true peace, not only between men in this life, but between man and God for all eternity in heaven. Since God wants every human being to possess this truth and happiness, the Catholic Church has a duty to spread its teachings and manifest its presence as far and wide as possible. These teachings come directly from God Himself and are thus free of all falsehood, and the Church, therefore, must lovingly encourage all souls, for their own good, to abandon error and embrace the truth.
Catholicism, through ecumenism, upholds the rights of God and promotes conversion while modernism pursues dialogue and compromise.
2/ This modernist desire to make the people feel more included and important in the liturgy has produced several other noticeable changes: the Blessed Sacrament (traditionally the focus of all liturgical prayer and adoration) is now often reserved away from the main altar and out of view; Latin, the sacred language of the Catholic Church, has been replaced by the various vernacular tongues; the laity often read the Epistle and Gospel during Mass, roles once reserved to clerics; the number of genuflections and other signs of respect and submission shown to God have been reduced; lay ministers now distribute the Eucharist which the faithful receive standing and in the hand; altar girls share liturgical responsibilities with altar boys.
The fruits of these changes have been, among many others, a shocking reduction in the number of religious vocations and a decrease in weekly attendance at Mass. Sacramental confession, as an important preparation before receiving the Eucharist, has also steadily declined.