“… Over the past few years, several of today’s 50 states have descended into unmanageable public indebtedness. … With things this far gone, even an aroused public or a sudden eruption of statesmanship is unlikely to prevent a crash. In some states, government unions have barricaded their benefit levels behind a Maginot Line of legal and even constitutional protections. … Sooner or later, we can anticipate pleas for nationalization of these impossible obligations. …”