Huh? After only six years, the US under the Articles were dissolving before the eyes of the world. That is why the states convened the 1787 convention. For example, when MA, RI and NH imposed restraints on British trade in the hope of exacting concessions from Parliament, Connecticut not only opened her ports to unrestricted trade with England, but went so far as to lay duties on imports from MA!
The purpose of the convention was the amend the articles, not to create an entire new system of government. Specifically, they were supposed to give to the Congress power to regulate commerce(power over duties and imposts--the states would cede this power), power to lay taxes and pay common debts.
But since they didn't amend the Articles, but rather created a new-fangled consolidated government, we'll never know what would have happened.
The articles might have been amended and things could have gone fine. The Constitution might have been rejected. They might have gone back to the drawing board and created a better new Constitution that what we got. No way of knowing. Pointless statement--unprovable.
You are dealing with a know-it-all who wants to pretend in some conspiracy or that history didn’t happen or that the colonies were united in such a way that the European powers would not have eaten them up. Absurd.