I don't think that is the case at all. From a practical perspective many people probably choose to stay connected (particularly in the southern states) to ensure they have a reliable energy supply over winter.
Sure you could guarantee your energy and completely disconnect from the network with enough power walls and solar panels, but the capital investment would be relatively huge - so it will be a principle based decision and not based on pure economics.
Sure you could guarantee your energy and completely disconnect from the network with enough power walls and solar panels, but the capital investment would be relatively huge - so it will be a principle based decision and not based on pure economics.