Smell test? This discussion demonstrates that in this continuing debate it all depends who’s doing the smelling and whether ex post facto stiffs can be relied upon. If they can be, then what is called the “New Testament” is likewise open to new sniffing and a “Newer Improved Testament” and then an “Even Newer and More Improved Testament,” etc could and should logically be in the offing.
History doesn't support your assumption. There have been new translations, and new understandings of old mysteries... but then, that simply shows the Wisdom of God in giving the Church a Magisterium to teach and to hold the doctrines and Scriptures firm. Although the Catholic Church is formed of men and men have a tendency to abuse and corruption which must be dealt with from time to time, the doctrines and dogma of the Church have not wavered in 2,000 years. We study the same Scripture the early Church Fathers studied.
To those outside the Church, the New Testament seems to be something invented. However, closer examination shows it to be seamless with the Old Testament. The Church studies Scripture through typology which shows that the New Covenant is promised in the Old, and the Old is fulfilled in the New. Typology shows us that passing from the Old to the New is more than just turning the page from Malachi to Matthew. It shows us how Jesus' coming, in the fullness of time, represents the hinge of history — world history and personal history, your life and mine. Typology is not just a literary device, not just an interpretive key to a difficult book. Typology means something intimate for all of us, our movement from servitude to sonship, from time to eternity, from the natural to the supernatural, from earth to heaven . . . from our Creator to our Father. (the last part was borrowed from Scott Hahn)
A real understanding of the promises of God, revealed in Christ and carried forward in the Church, would clearly demonstrate the absurdity of your logical proposition.