You just mowed down a regiment of straw men. The point is that the vast majority of our problems could be solved by simply abiding by the constitution as it exists, even with its flaws, most of which are the result of previously passed amendments. There is no point in giving the same crowd a different constitution to ignore. They proudly support the constitution when it says or they can pretend it says what they want it to say. They studiously ignore anything which says something they don’t like. Without some way to change that fact there is simply zero point in proposing new amendments. It matters not what a doctor prescribes for a patient who will not take his medicine.
If, for example, term limits are imposed much of the dynamic which generates the culture which ignores the Constitution will be changed for the better. So it is with a series of "process" amendments. It is virtually impossible, for example, to evade a term limit amendment.
So, we will not be giving "the same crowd" a new constitution to ignore, we will be creating a "new crowd" who in their turn will spawn future generations of Washington insiders that will piss off our great-grandchildren. Meanwhile, the Republic might be saved.
Let us avoid the counsel of despair and let us not permit the perfect be the enemy of the good.