No, but you've misstated the case.
Both the old Articles of Confederation and the new Constitution were considered "perpetual" and "forever."
The new Constitution provided methods to change or amend it, but no methods for unilateral secession.
Yes, the Founders recognized that the Union might be dissolved, but only by mutual consent or from "usurpations" or "abuses" having that same effect.
In their ratification statement, Virginia spelled this out with the following words:
"powers granted under the Constitution, being derived from the people of the United States may be resumed by them whensoever the same shall be perverted to their injury or oppression"
But in December 1860, when South Carolina first seceded, there were no "abuses" or "usurpations" or "injury" or "oppression."
There was only a perceived possible future threat against slavery, represented by the Abolitionist Republicans, and their President-elect, Lincoln.
And Southerns did not just unilaterally, unconstitutionally secede -- they also immediately began unlawfully seizing Federal forts, armories, ships, customs houses, a mint, etc.
At the same time, they began firing on Federal Forces, and on May 6, 1861 declared war on the United States.
The South wanted war, the South got war.
And of all Confederate States, no state wanted war more than Virginia, which did not actually join the Confederacy until after it declared war on the United States.
Unlike, say, Florida or Alabama, which joined the Confederacy while it was still technically at peace, Virginia had a choice and it chose war.
That wasn't possible then, AND STILL isn't possible. The USC remains silent on the issue.
Can you show a link to that. I've heard different dates and I have yet to see the actual declaration.