Resulting in a document that lacked the essential element of self-protection. Which is why the US must avoid a constitutional convention at any cost - such an “emergencies only, we pinky-swear, promise!” clause would no doubt be added… no matter which party was in power. It would probably be a complex, three- or four-part “clause” too nebulous for TV newsers to understand and would be argued for by pointing to all the troubles of the past few decades.
And the US as a democracy would become a walking corpse.