When two people get married, they speak their vows. Now, even though those two people will change over the following ten, twenty, thirty years, the vows will remain the same for the life of the marriage. If the husband says after twenty years, “Our marriage vows are outdated. I think we should rewrite them to fit our current situation more accurately,” what he’s really saying is, “I want our marriage as it has been for the last twenty years to end, and I want to create an entirely new marriage.”
It is the same with a nation’s constitution. The constitution, as written by the nation’s founders, is meant to remain unchanged for the lifespan of that nation. When you hear people saying that it’s time to update the constitution, what they’re really saying is that they want a revolution — they want a new nation.