The statement posits a significant shift in the nature of the state, moving from an 'arbitrator state' to a 'regulatory state,' and suggests that the rise of the latter signifies the 'demise' of the former. This perspective holds considerable validity in understanding the evolution of modern governance.

Historically, the 'arbitrator state,' often associated with classical liberalism and the 'night-watchman state,' was characterized by minimal intervention in economic and social affairs. Its primary role was to maintain law and order, enforce contracts, protect property rights, and act as an impartial arbiter in disputes between private parties. The state was seen as a neutral umpire, ensuring a level playing field but not actively shaping market outcomes or social behavior. Its focus was largely on negative liberties – freedom from state interference.

However, the 20th century witnessed the emergence of complex industrial societies, market failures (e.g., monopolies, externalities like pollution), and demands for social welfare. This led to a re-evaluation of the state's role, paving the way for the 'regulatory state.' The regulatory state is characterized by its proactive and pervasive intervention in various sectors of society and the economy. It establishes specialized agencies (e.g., environmental protection agencies, financial regulators, consumer protection bodies) tasked with setting standards, monitoring compliance, enforcing rules, and often licensing activities. These agencies are not merely arbiters; they are active shapers of policy, market behavior, and social outcomes.

The advent of regulatory regimes indeed indicates the demise of the arbitrator state for several reasons:

1. Proactive vs. Reactive Role: The arbitrator state was largely reactive, intervening only when disputes arose. The regulatory state is proactive, setting rules and standards before problems occur, aiming to prevent harm and achieve specific public policy goals (e.g., clean air, safe food, financial stability).
2. Scope of Intervention: The arbitrator state's intervention was limited to basic legal frameworks. The regulatory state's reach extends into intricate details of production, consumption, environmental impact, labor relations, and public health, reflecting a much broader understanding of public interest.
3. Nature of Power: The arbitrator state exercised power primarily through courts and general law enforcement. The regulatory state exercises power through specialized expertise, rule-making (delegated legislation), and administrative enforcement, often with significant discretion.
4. Shift in Objectives: The arbitrator state focused on individual liberties and market efficiency through non-intervention. The regulatory state aims for collective welfare, social justice, and correcting market imperfections, often prioritizing positive liberties and collective goods.

While elements of the arbitrator state (like the judiciary's role in dispute resolution) still exist, the dominant paradigm of state action has undeniably shifted. The modern state is no longer content to merely arbitrate; it actively regulates, manages, and steers. This transformation reflects a fundamental change in the understanding of governance, where the state is seen as an essential actor in shaping societal outcomes rather than just an impartial referee. Thus, the statement accurately captures this profound historical and conceptual shift, marking the 'demise' of the arbitrator state as the primary model of governance.