2 is right, but the reasons aren't for aggrandizement (at least, not mainly). It's for more power and the legitimacy of that power.
But it seems that they don't need to convene a convention if the Supreme Court and Congress can simply allow Trump to ignore laws with impunity.
This is an .ml take. There are many, many writings where they opposed specific policies now undertaken by the Trump regime. You can start with the Declaration of Independence if you'd like.
Regardless, they're dead and we're not. Governments are for the living. (That's something they thought too, by the way.)