California has a diverse and robust economy. They will be fine as a country. There may some good reasons to oppose this but the economy IS NOT one of them.
“We, the delegates of the people of Virginia, duly elected in pursuance of a recommendation from the general assembly, and now met in convention, having fully and freely investigated and discussed the proceedings of the Federal Convention, and being prepared as well as the most mature deliberation hath enabled us to decide thereon, Do, in the name and in behalf of the people of Virginia, declare and make known that the powers granted under the Constitution being derived from the people of the United States may be resumed by them whensoever the same shall be perverted to their injury or oppression, and that every power not granted thereby remains with them and at their will....”
“We, the delegates of the people of New York... do declare and make known that the powers of government may be reassumed by the people whenever it shall become necessary to their happiness; that every power, jurisdiction, and right which is not by the said Constitution clearly delegated to the Congress of the United States, or the department of the government thereof, remains to the people of the several States, or to their respective State governments, to whom they may have granted the same; and that those clauses in the said Constitution, which declare that Congress shall not have or exercise certain powers, do not imply that Congress is entitled to any powers not given by the said Constitution; but such clauses are to be construed either as exceptions in certain specified powers or as inserted merely for greater caution.”
“We, the delegates of the people of Rhode Island and Plantations, duly elected... do declare and make known... that the powers of government may be resumed by the people whenever it shall become necessary to their happiness; that every power, jurisdiction, and right which is not by the said Constitution clearly delegated to the Congress of the United States, or the department of the government thereof, remains to the people of the several States, or to their respective State governments, to whom they may have granted the same; that Congress shall guarantee to each State its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Constitution expressly delegated to the United States.”