Thank you for the editorial noting that "there is something very wrong with the relationship between the Los Angeles County Board of Supervisors and the voters who elect them."
The larger issue, stated but not elaborated on in the editorial, is the lack of checks and balances in the country. The basic structure of county government is that the Board of Supervisors is both the legislature and the executive. These two responsibilities must be separated. Perhaps then the appellation of the "five kings" would be inappropriate.
The solution is to have one county executive who is accountable to voters and five or more legislators who are also elected. Increasing the number of supervisors is just increasing the number of kings.