Yes, but you are one step closer. Why give them another step?
Same thing with Congress proposing amendments, except Congress would be more liberal than a Con-Con. The fact is that the Ruling Class treats the Con-Con with dread--and propagandizes it as a horrible idea--because they don't want to lose control over proposing amendments. The Con-Con delegation would almost certainly be conservative (we control the state legislatures), and it would give a chance for we the people to reign in the Ruling Class. This is exactly why they hate it.