Rather than split into new states, California should divide internally into sub-state regions. That way California remains united in some fashion for resident's rights and state agencies. Consequently the regional-prefect governors will gain more power in a step wise evolutionary process, instead of cutting it cold turkey.
If California were to split up into smaller political entities. No doubt there would be a fight as to which offspring prefect would get to keep the California state flag. In this case they remain as the State of California but have a new regional-prefect flags.
This keeps California together, and allows regional sectors to more effectively govern at the expense of the state government. Additionally, California keeps all her problems to herself, without dragging other states to take care of her business.
Many of the proposed prefect flags of California are based upon historical flags and flags that currently fly over California.