Nonsense. The word "perpetual" does not appear in the Constitution, nor does permanent or any other derivation of the word/meaning.
It's been perpetual so far.
You're telling a big 'un any way, as the Preamble surely states that the Union is to be made more perfect. And what could be more permanent than a petpetual Union made more perfect?
That's what the Chief Justice of the United States thought, any way. And what about:
"The framers of our Constitution never exhausted so much labor, wisdom and forebearance in its formation, and surrounded it with so many guards and securities, if it was to be broken by every member of the Confederacy at will. It was intended for 'perpetual union' so expressed in the preamble, and for the establishment of a government, not a compact, which can only be dissolved by revolution, or the consent of all the people in convention assembled. It is idle to talk of secession."
Robert E. Lee, January 23, 1861
Walt
Your logic does not follow. Nothing about the phrase "more perfect" even remotely hints at the term "perpetual." The leap between the two is an arbitrary one of your own construction.