Yes, there is a right of revolution. Our very nation is founded upon it.
However.
Unilateral secession must inevitably have recourse to the Laws of War. A seceding California must either purchase, leave alone, or seize all the assets within the State that were created by and belong to the rest of us.
Since they cannot afford to purchase the Navy facilities at San Diego, for example, and since we would be crazy to give them up, they must have recourse to the Laws of War to have them, and, once that dog is let out of its kennel (which, as you point out above, they have the Right to do), then they will have to abide by the result.
And the result of California warring on the United States is quite unlikely to produce the result the secessionists desire.
A half-truth. According to the DECLARATION, 'it is the Right of the People to alter or to abolish' the government.
If you allow government to control the extent and exercise of our Rights.... that makes all the government's 'gun control' laws legitimate.
We may have a Right to a Revolution, but that still doesn't give the government the ability to control secession, particularly since their is no authority given FOR it in the Constitution.
Says who? You can't operate under the Articles of War until war is Declared.
War is a FORMAL process of government, not an action.