Do you really believe that the Spirit could deceive generation after generation until the present day?
No, one's concept of Original Sin does not need to change. Without the concept of Original Sin the whole of both Testaments of the Bible, the Life, Passion, Death, Resurrection and Ascension into heaven of Our Blessed Lord, the Sacrifice of the Mass, the whole of Christianity becomes meaningless and irrelevant to our lives here on earth. Without it the whole purpose of our lives becomes a quest for comfort and ease both physically and psychologically.
The establishment of heaven upon earth is the fools' paradise.