I am no longer so certain that oral tradition can be so easily changed. I suppose it can be changed, but I do not believe that the Church Fathers would have allowed such changes to take place. In fact, whenever somebody did speak out against the traditions they received from the Apostles, they rebuked those people harshly as heretics and excommunicated them. And this happened many times before anything close to a canon of the New Testament came into form. The fact is, the Church Fathers – who, in some cases, lived two hundred years before the New Testament was set – defended the truths of the faith with little more than oral tradition to go on. My point is that these were the Traditions of God, not the traditions of men. We have to make a distinction between the two, as St. Paul does.
I am interested in seeing some backing for this point, specifically regarding the excommunications of those who spoke out against the Apostles traditions. I am also interested specifically who the Church Fathers were that you refer to. And lastly, although the New Testament (NT) was not canonized until around 350 – 400 AD, the letters and documents that composed the NT were completed by 70 AD. Oral traditions had the help of written documentation at that time and before, because some of Paul’s epistles were written much earlier, and the Gospels were around as well.
I do not hold that the oral traditions were not important, or even that they did not hold a place of infallibility, only that at some point in time, their use was no longer needed with the maturity of a more perfect medium, one whose face could be looked upon by each Christian.
I will also say this, I don’t think the doctrine of sola scriptura should be used as an excuse for rebellion. Inside of church government all things have their place, including the authority of those who have been placed over us. What I do hold vital is the need for a written document to prevent the straying of man from God’s truth, because it is proven that man is fallible, wicked, and deceitful above all things and not to be trusted to remember or accurately convey the Truth all the time. This is illustrated by the fact that in Acts 17:10-12, when the saints in Berea studied the scriptures to verify the words of Paul and Barnabas to see if they were true.